commit 13438289fe06d75d02e0fa4469bef2a7b92edf9e
Author: Warren <warren@momentry.ddns.net>
Date:   Wed Jul 1 09:06:41 2026 +0800

    Initial commit: telfax - Rust Fax Server
    
    - Modem driver (serialport) with AT command interface
    - Class 1 fax protocol (T.30 session, HDLC framing)
    - T.4/T.6 image codec (fax crate integration)
    - Document conversion (image to fax, TIFF-F output)
    - REST API (axum) for fax job management
    - SQLite/InMemory job queue
    - CLI interface (detect/serve/send/test)
    - Integration tests passing

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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..8b011f7
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,63 @@
+[package]
+name = "telfax"
+version = "0.1.0"
+edition = "2024"
+description = "A standalone fax server library and application"
+license = "MIT"
+
+[features]
+default = ["server"]
+server = ["dep:axum", "dep:clap", "dep:tokio", "dep:rusqlite", "dep:tower-http", "dep:tracing-subscriber"]
+cli = ["dep:clap"]
+
+[lib]
+name = "telfax"
+
+[[bin]]
+name = "telfax"
+path = "src/main.rs"
+required-features = ["server"]
+
+[dependencies]
+# Serial modem
+serialport = "4.3"
+
+# Fax codec (T.4/T.6 compression)
+fax = "0.2"
+
+# Document handling
+image = "0.25"
+tiff = "0.11"
+lopdf = "0.36"
+
+# Error handling
+thiserror = "2"
+anyhow = "1"
+
+# Serialization
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+
+# Logging
+tracing = "0.1"
+
+# Async (for server mode)
+tokio = { version = "1", features = ["full"], optional = true }
+axum = { version = "0.8", optional = true }
+tower-http = { version = "0.6", features = ["cors"], optional = true }
+tracing-subscriber = { version = "0.3", features = ["json", "env-filter"], optional = true }
+
+# CLI / Config
+clap = { version = "4", features = ["derive"], optional = true }
+
+# Queue persistence
+rusqlite = { version = "0.32", features = ["bundled"], optional = true }
+
+# UUID for job IDs
+uuid = { version = "1", features = ["v4", "serde"] }
+
+# Date/time
+chrono = { version = "0.4", features = ["serde"] }
+
+# Config file parsing
+toml = "0.8"
diff --git a/src/api/mod.rs b/src/api/mod.rs
new file mode 100644
index 0000000..af6c051
--- /dev/null
+++ b/src/api/mod.rs
@@ -0,0 +1,3 @@
+pub mod routes;
+
+pub use routes::start_server;
diff --git a/src/api/routes.rs b/src/api/routes.rs
new file mode 100644
index 0000000..ab12dfd
--- /dev/null
+++ b/src/api/routes.rs
@@ -0,0 +1,128 @@
+use axum::{
+    extract::State,
+    http::StatusCode,
+    response::Json,
+    routing::{get, post},
+    Router,
+};
+use serde::{Deserialize, Serialize};
+use std::sync::{Arc, Mutex};
+use tracing::info;
+
+use crate::config::FaxConfig;
+use crate::error::Result as FaxResult;
+use crate::queue::job::{FaxJob, JobId};
+use crate::queue::store::FaxQueue;
+
+#[derive(Clone)]
+pub struct AppState {
+    pub config: FaxConfig,
+    pub queue: Arc<Mutex<FaxQueue>>,
+}
+
+#[derive(Serialize)]
+pub struct HealthResponse {
+    pub status: String,
+    pub device: String,
+}
+
+#[derive(Deserialize)]
+pub struct SendFaxRequest {
+    pub recipient: String,
+    pub document_path: String,
+}
+
+#[derive(Serialize)]
+pub struct SendFaxResponse {
+    pub job_id: JobId,
+}
+
+#[derive(Serialize)]
+pub struct JobResponse {
+    pub id: JobId,
+    pub recipient: String,
+    pub status: String,
+    pub pages: u32,
+    pub created_at: String,
+}
+
+async fn health(State(state): State<AppState>) -> Json<HealthResponse> {
+    Json(HealthResponse {
+        status: "ok".to_string(),
+        device: state.config.device.clone(),
+    })
+}
+
+async fn send_fax(
+    State(state): State<AppState>,
+    Json(req): Json<SendFaxRequest>,
+) -> Result<Json<SendFaxResponse>, StatusCode> {
+    let job = FaxJob::new(req.recipient, req.document_path);
+    let job_id = job.id;
+
+    let mut queue = state.queue.lock().unwrap();
+    queue.enqueue(job).map_err(|_| StatusCode::INTERNAL_SERVER_ERROR)?;
+
+    info!(job_id = %job_id, "Fax job queued");
+    Ok(Json(SendFaxResponse { job_id }))
+}
+
+async fn list_jobs(State(state): State<AppState>) -> Json<Vec<JobResponse>> {
+    let queue = state.queue.lock().unwrap();
+    let jobs = queue.list();
+    let responses: Vec<JobResponse> = jobs
+        .into_iter()
+        .map(|j| JobResponse {
+            id: j.id,
+            recipient: j.recipient,
+            status: format!("{:?}", j.status),
+            pages: j.pages,
+            created_at: j.created_at.to_rfc3339(),
+        })
+        .collect();
+    Json(responses)
+}
+
+async fn get_job(
+    State(state): State<AppState>,
+    axum::extract::Path(id): axum::extract::Path<JobId>,
+) -> Result<Json<JobResponse>, StatusCode> {
+    let queue = state.queue.lock().unwrap();
+    queue.get(&id).map(|j| Json(JobResponse {
+        id: j.id,
+        recipient: j.recipient,
+        status: format!("{:?}", j.status),
+        pages: j.pages,
+        created_at: j.created_at.to_rfc3339(),
+    })).ok_or(StatusCode::NOT_FOUND)
+}
+
+pub async fn start_server(config: FaxConfig, queue: Arc<Mutex<FaxQueue>>) -> FaxResult<()> {
+    let state = AppState {
+        config: config.clone(),
+        queue,
+    };
+
+    let app = Router::new()
+        .route("/api/health", get(health))
+        .route("/api/fax/send", post(send_fax))
+        .route("/api/fax/jobs", get(list_jobs))
+        .route("/api/fax/jobs/{id}", get(get_job))
+        .with_state(state);
+
+    let addr = config
+        .api_listen
+        .clone()
+        .unwrap_or_else(|| "0.0.0.0:3000".to_string());
+    info!("Starting API server on {}", addr);
+
+    let listener = tokio::net::TcpListener::bind(&addr)
+        .await
+        .map_err(|e| crate::error::FaxError::Other(format!("Failed to bind: {}", e)))?;
+
+    axum::serve(listener, app)
+        .await
+        .map_err(|e| crate::error::FaxError::Other(format!("Server error: {}", e)))?;
+
+    Ok(())
+}
diff --git a/src/config.rs b/src/config.rs
new file mode 100644
index 0000000..1d1b84c
--- /dev/null
+++ b/src/config.rs
@@ -0,0 +1,97 @@
+use serde::{Deserialize, Serialize};
+use std::path::PathBuf;
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct FaxConfig {
+    #[serde(default = "default_device")]
+    pub device: String,
+
+    #[serde(default = "default_baud_rate")]
+    pub baud_rate: u32,
+
+    #[serde(default = "default_station_id")]
+    pub station_id: String,
+
+    #[serde(default = "default_header")]
+    pub header: String,
+
+    #[serde(default = "default_resolution")]
+    pub resolution: FaxResolution,
+
+    #[serde(default = "default_ecm")]
+    pub ecm: bool,
+
+    #[serde(default = "default_volume")]
+    pub speaker_volume: u8,
+
+    #[serde(default)]
+    pub queue_db: Option<PathBuf>,
+
+    #[serde(default)]
+    pub api_listen: Option<String>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub enum FaxResolution {
+    Standard,  // 98 dpi
+    Fine,      // 196 dpi (7.7 l/mm)
+    SuperFine, // 392 dpi (15.4 l/mm)
+}
+
+impl Default for FaxConfig {
+    fn default() -> Self {
+        Self {
+            device: default_device(),
+            baud_rate: default_baud_rate(),
+            station_id: default_station_id(),
+            header: default_header(),
+            resolution: default_resolution(),
+            ecm: default_ecm(),
+            speaker_volume: default_volume(),
+            queue_db: None,
+            api_listen: None,
+        }
+    }
+}
+
+fn default_device() -> String {
+    "/dev/cu.usbmodem00000021".to_string()
+}
+
+fn default_baud_rate() -> u32 {
+    115200
+}
+
+fn default_station_id() -> String {
+    "+1-555-FAX-0001".to_string()
+}
+
+fn default_header() -> String {
+    "Telfax".to_string()
+}
+
+fn default_resolution() -> FaxResolution {
+    FaxResolution::Fine
+}
+
+fn default_ecm() -> bool {
+    true
+}
+
+fn default_volume() -> u8 {
+    2
+}
+
+impl FaxResolution {
+    pub fn vertical_lpi(&self) -> u32 {
+        match self {
+            FaxResolution::Standard => 98,
+            FaxResolution::Fine => 196,
+            FaxResolution::SuperFine => 392,
+        }
+    }
+
+    pub fn horizontal_dpi(&self) -> u32 {
+        204
+    }
+}
diff --git a/src/document/convert.rs b/src/document/convert.rs
new file mode 100644
index 0000000..c18eddf
--- /dev/null
+++ b/src/document/convert.rs
@@ -0,0 +1,83 @@
+use crate::error::{FaxError, Result};
+use image::GenericImageView;
+
+#[derive(Debug, Clone)]
+pub enum DocumentFormat {
+    Pdf,
+    Tiff,
+    Image,
+}
+
+#[derive(Debug, Clone)]
+pub struct Page {
+    pub pixels: Vec<u8>,
+    pub width_pels: u32,
+    pub rows: u32,
+}
+
+#[derive(Debug, Clone)]
+pub struct FaxDocument {
+    pub pages: Vec<Page>,
+    pub format: DocumentFormat,
+}
+
+/// Create a FaxDocument from raw TIFF Group 3/4 data.
+pub fn document_from_tiff(_data: &[u8]) -> Result<FaxDocument> {
+    Err(FaxError::document("TIFF to fax document not yet implemented"))
+}
+
+/// Create a FaxDocument from an image file (PNG, JPEG, etc.)
+pub fn document_from_image(data: &[u8]) -> Result<FaxDocument> {
+    let img = image::load_from_memory(data)
+        .map_err(|e| FaxError::document(format!("Failed to load image: {}", e)))?;
+
+    let (width, height) = img.dimensions();
+    let gray = img.to_luma8();
+
+    let fax_width = if width > 1728 { 1728 } else { width };
+    let fax_rows = (height as f64 * (fax_width as f64 / width as f64)) as u32;
+
+    let bytes_per_row = ((fax_width + 7) / 8) as usize;
+    let mut pixels = vec![0u8; bytes_per_row * fax_rows as usize];
+
+    for y in 0..fax_rows {
+        let src_y = (y as f64 * height as f64 / fax_rows as f64) as u32;
+        let row_start = y as usize * bytes_per_row;
+
+        let mut bit_idx: u8 = 0;
+        let mut byte_val: u8 = 0;
+        let mut byte_pos: usize = 0;
+
+        for x in 0..fax_width {
+            let src_x = (x as f64 * width as f64 / fax_width as f64) as u32;
+            let pixel = gray.get_pixel(src_x, src_y)[0];
+            if pixel < 128 {
+                byte_val |= 1 << (7 - bit_idx);
+            }
+            bit_idx += 1;
+            if bit_idx >= 8 {
+                let idx = row_start + byte_pos;
+                if idx < pixels.len() {
+                    pixels[idx] = byte_val;
+                }
+                byte_pos += 1;
+                bit_idx = 0;
+                byte_val = 0;
+            }
+        }
+        if bit_idx > 0 && row_start + byte_pos < pixels.len() {
+            pixels[row_start + byte_pos] = byte_val;
+        }
+    }
+
+    let page = Page {
+        pixels,
+        width_pels: fax_width,
+        rows: fax_rows,
+    };
+
+    Ok(FaxDocument {
+        pages: vec![page],
+        format: DocumentFormat::Image,
+    })
+}
diff --git a/src/document/mod.rs b/src/document/mod.rs
new file mode 100644
index 0000000..1972e38
--- /dev/null
+++ b/src/document/mod.rs
@@ -0,0 +1,5 @@
+pub mod convert;
+pub mod tiff;
+
+pub use convert::{document_from_image, document_from_tiff, DocumentFormat, FaxDocument, Page};
+pub use tiff::TiffFaxWriter;
diff --git a/src/document/tiff.rs b/src/document/tiff.rs
new file mode 100644
index 0000000..12fd357
--- /dev/null
+++ b/src/document/tiff.rs
@@ -0,0 +1,35 @@
+use crate::document::convert::Page;
+use crate::error::{FaxError, Result};
+use tiff::encoder::colortype::Gray8;
+use tiff::encoder::TiffEncoder;
+
+pub struct TiffFaxWriter;
+
+impl TiffFaxWriter {
+    pub fn write_fax_tiff(path: &std::path::Path, pages: &[Page]) -> Result<()> {
+        if pages.is_empty() {
+            return Err(FaxError::document("No pages to write"));
+        }
+
+        let file = std::fs::File::create(path)?;
+        let mut encoder = TiffEncoder::new(&file)
+            .map_err(|e| FaxError::document(format!("Failed to create TIFF encoder: {}", e)))?;
+
+        for page in pages {
+            // Convert 1-bit fax data to 8-bit grayscale for TIFF storage.
+            let mut gray_data = Vec::with_capacity((page.width_pels * page.rows) as usize);
+            for &byte in &page.pixels {
+                for bit_idx in (0..8).rev() {
+                    let bit = (byte >> bit_idx) & 1;
+                    gray_data.push(if bit == 1 { 0u8 } else { 255u8 });
+                }
+            }
+
+            encoder
+                .write_image::<Gray8>(page.width_pels, page.rows, &gray_data)
+                .map_err(|e| FaxError::document(format!("Failed to write TIFF page: {}", e)))?;
+        }
+
+        Ok(())
+    }
+}
diff --git a/src/error.rs b/src/error.rs
new file mode 100644
index 0000000..b7c0e59
--- /dev/null
+++ b/src/error.rs
@@ -0,0 +1,74 @@
+use thiserror::Error;
+
+pub type Result<T> = std::result::Result<T, FaxError>;
+
+#[derive(Error, Debug)]
+pub enum FaxError {
+    #[error("Serial port error: {0}")]
+    Serial(#[from] serialport::Error),
+
+    #[error("Modem error: {0}")]
+    Modem(String),
+
+    #[error("AT command failed: cmd={cmd}, response={response}")]
+    AtCommand { cmd: String, response: String },
+
+    #[error("Modem timeout after {ms}ms")]
+    Timeout { ms: u64 },
+
+    #[error("Protocol error: {0}")]
+    Protocol(String),
+
+    #[error("No carrier / connection lost")]
+    NoCarrier,
+
+    #[error("Remote station error (training failed)")]
+    TrainingFailed,
+
+    #[error("Fax document error: {0}")]
+    Document(String),
+
+    #[error("T.4 codec error: {0}")]
+    T4Codec(String),
+
+    #[error("HDLC framing error: {0}")]
+    Hdlc(String),
+
+    #[error("I/O error: {0}")]
+    Io(#[from] std::io::Error),
+
+    #[error("Invalid configuration: {0}")]
+    Config(String),
+
+    #[error("Not supported by modem: {0}")]
+    NotSupported(String),
+
+    #[cfg(feature = "server")]
+    #[error("Database error: {0}")]
+    Database(#[from] rusqlite::Error),
+
+    #[error("{0}")]
+    Other(String),
+}
+
+impl FaxError {
+    pub fn modem(msg: impl Into<String>) -> Self {
+        Self::Modem(msg.into())
+    }
+
+    pub fn protocol(msg: impl Into<String>) -> Self {
+        Self::Protocol(msg.into())
+    }
+
+    pub fn document(msg: impl Into<String>) -> Self {
+        Self::Document(msg.into())
+    }
+
+    pub fn t4(msg: impl Into<String>) -> Self {
+        Self::T4Codec(msg.into())
+    }
+
+    pub fn config(msg: impl Into<String>) -> Self {
+        Self::Config(msg.into())
+    }
+}
diff --git a/src/fax/class1/mod.rs b/src/fax/class1/mod.rs
new file mode 100644
index 0000000..e26c3c9
--- /dev/null
+++ b/src/fax/class1/mod.rs
@@ -0,0 +1,27 @@
+pub mod send;
+pub mod recv;
+pub mod session;
+
+pub use send::Class1Send;
+pub use recv::Class1Recv;
+pub use session::T30Session;
+
+use crate::modem::driver::ModemDriver;
+
+pub struct Class1Session<'a> {
+    driver: &'a mut ModemDriver,
+}
+
+impl<'a> Class1Session<'a> {
+    pub fn new(driver: &'a mut ModemDriver) -> Self {
+        Self { driver }
+    }
+
+    pub fn sender(self) -> Class1Send<'a> {
+        Class1Send::new(self.driver)
+    }
+
+    pub fn receiver(self) -> Class1Recv<'a> {
+        Class1Recv::new(self.driver)
+    }
+}
diff --git a/src/fax/class1/recv.rs b/src/fax/class1/recv.rs
new file mode 100644
index 0000000..9a38d69
--- /dev/null
+++ b/src/fax/class1/recv.rs
@@ -0,0 +1,35 @@
+use crate::error::{FaxError, Result};
+use crate::fax::class1::session::{T30Event, T30Session};
+use crate::modem::driver::ModemDriver;
+
+pub struct Class1Recv<'a> {
+    driver: &'a mut ModemDriver,
+    session: T30Session,
+}
+
+impl<'a> Class1Recv<'a> {
+    pub fn new(driver: &'a mut ModemDriver) -> Self {
+        Self {
+            driver,
+            session: T30Session::new(),
+        }
+    }
+
+    pub fn receive_fax(&mut self) -> Result<Vec<u8>> {
+        let mut at = crate::modem::at::AtChannel::new(self.driver);
+
+        at.send_command("AT+FCLASS=1", 2000)?;
+        at.send_command("ATS0=1", 2000)?;
+
+        tracing::info!("Waiting for incoming call...");
+        let _ring = self.driver.read_until(b"RING\r\n", 120_000)?;
+        tracing::info!("RING received");
+
+        let _conn = self.driver.read_until(b"CONNECT\r\n", 60000)?;
+        tracing::info!("Incoming fax connected");
+
+        self.session.transition(T30Event::Connected);
+
+        Err(FaxError::protocol("Receive not yet fully implemented"))
+    }
+}
diff --git a/src/fax/class1/send.rs b/src/fax/class1/send.rs
new file mode 100644
index 0000000..16999d2
--- /dev/null
+++ b/src/fax/class1/send.rs
@@ -0,0 +1,219 @@
+use crate::error::{FaxError, Result};
+use crate::fax::class1::session::{T30Event, T30Session};
+use crate::fax::hdlc::{build_hdlc_frame, parse_hdlc_frame};
+use crate::fax::negotiate::{DataRate, FaxCapabilities};
+use crate::modem::driver::ModemDriver;
+
+pub struct Class1Send<'a> {
+    driver: &'a mut ModemDriver,
+    session: T30Session,
+    #[allow(dead_code)]
+    caps: FaxCapabilities,
+    data_rate: DataRate,
+}
+
+impl<'a> Class1Send<'a> {
+    pub fn new(driver: &'a mut ModemDriver) -> Self {
+        Self {
+            driver,
+            session: T30Session::new(),
+            caps: FaxCapabilities::default(),
+            data_rate: DataRate::V17_14400,
+        }
+    }
+
+    fn at(&mut self) -> crate::modem::at::AtChannel<'_> {
+        crate::modem::at::AtChannel::new(self.driver)
+    }
+
+    pub fn send_fax(
+        &mut self,
+        number: &str,
+        page_data: &[u8],
+        _page_width: u32,
+        _page_rows: u32,
+    ) -> Result<()> {
+        self.enter_class1()?;
+        self.set_speaker_volume()?;
+        self.dial(number)?;
+
+        self.session.transition(T30Event::Connected);
+
+        let dis_frame = self.receive_hdlc_frame()?;
+        tracing::info!("Received DIS frame ({} bytes)", dis_frame.len());
+
+        let parsed_dis = parse_hdlc_frame(&dis_frame)?;
+        tracing::info!(control = parsed_dis.control, "Parsed DIS");
+        self.negotiate_caps(&parsed_dis)?;
+
+        let dcs_data = self.build_dcs();
+        let dcs_frame = build_hdlc_frame(0x28, &dcs_data);
+        self.transmit_hdlc_frame(&dcs_frame)?;
+        tracing::info!("Sent DCS");
+
+        let rate_val = self.data_rate.to_modulation_value();
+        self.transmit_tcf(rate_val)?;
+        tracing::info!("Sent TCF");
+
+        let cfr_frame = self.receive_hdlc_frame()?;
+        let parsed_cfr = parse_hdlc_frame(&cfr_frame)?;
+        if parsed_cfr.control != 0x21 {
+            return Err(FaxError::protocol("Expected CFR frame"));
+        }
+        tracing::info!("Received CFR");
+        self.session.transition(T30Event::CfrReceived);
+
+        self.transmit_page_data(rate_val, page_data)?;
+        self.session.transition(T30Event::PageSent);
+
+        self.send_eop()?;
+        let mcf_frame = self.receive_hdlc_frame()?;
+        let parsed_mcf = parse_hdlc_frame(&mcf_frame)?;
+        tracing::info!(control = parsed_mcf.control, "Post-page response received");
+        self.session.transition(T30Event::McfReceived);
+
+        self.send_dcn()?;
+        self.hang_up()?;
+        self.session.transition(T30Event::DcnSent);
+
+        Ok(())
+    }
+
+    fn enter_class1(&mut self) -> Result<()> {
+        self.at().send_command("AT+FCLASS=1", 2000)?;
+        Ok(())
+    }
+
+    fn set_speaker_volume(&mut self) -> Result<()> {
+        self.at().send_command("ATM1L2", 1000).ok();
+        Ok(())
+    }
+
+    fn dial(&mut self, number: &str) -> Result<()> {
+        self.driver.drain()?;
+        let cmd = format!("ATDT{}\r", number);
+        self.driver.write_raw(cmd.as_bytes())?;
+        self.driver.flush()?;
+
+        let response = self.driver.read_until(b"\r\n", 60000)?;
+        let text = String::from_utf8_lossy(&response);
+        tracing::info!(response = %text, "Dial response");
+
+        if text.contains("NO CARRIER") || text.contains("BUSY") {
+            return Err(FaxError::NoCarrier);
+        }
+        if !text.contains("CONNECT") {
+            return Err(FaxError::modem(format!("Unexpected dial response: {}", text)));
+        }
+        Ok(())
+    }
+
+    fn receive_hdlc_frame(&mut self) -> Result<Vec<u8>> {
+        self.driver.write_raw(b"AT+FRH=3\r")?;
+
+        let response = self.driver.read_until(b"\r\n", 15000)?;
+        let text = String::from_utf8_lossy(&response);
+        tracing::debug!(response = %text, "FRH initial");
+
+        if text.contains("NO CARRIER") || text.contains("ERROR") {
+            return Err(FaxError::NoCarrier);
+        }
+
+        let result = self.driver.read_until(b"OK\r\n", 10000)?;
+        Ok(result)
+    }
+
+    fn transmit_hdlc_frame(&mut self, frame: &[u8]) -> Result<()> {
+        self.driver.write_raw(b"AT+FTH=3\r")?;
+
+        let response = self.driver.read_until(b"CONNECT\r\n", 10000)?;
+        let text = String::from_utf8_lossy(&response);
+        if text.contains("ERROR") {
+            return Err(FaxError::modem("Failed to start HDLC transmit"));
+        }
+
+        self.driver.write_raw(frame)?;
+        self.driver.flush()?;
+
+        let result = self.driver.read_until(b"OK\r\n", 5000)?;
+        let result_text = String::from_utf8_lossy(&result);
+        if result_text.contains("ERROR") {
+            return Err(FaxError::modem("HDLC transmit failed"));
+        }
+        Ok(())
+    }
+
+    fn transmit_tcf(&mut self, rate_val: u32) -> Result<()> {
+        let cmd = format!("AT+FTM={}\r", rate_val);
+        self.driver.write_raw(cmd.as_bytes())?;
+
+        let response = self.driver.read_until(b"CONNECT\r\n", 10000)?;
+        let text = String::from_utf8_lossy(&response);
+        if text.contains("ERROR") {
+            return Err(FaxError::modem("Failed to start TCF transmit"));
+        }
+
+        let tcf_data = vec![0u8; 2000];
+        self.driver.write_raw(&tcf_data)?;
+        self.driver.flush()?;
+
+        let result = self.driver.read_until(b"OK\r\n", 10000)?;
+        let result_text = String::from_utf8_lossy(&result);
+        if result_text.contains("ERROR") {
+            return Err(FaxError::TrainingFailed);
+        }
+        Ok(())
+    }
+
+    fn transmit_page_data(&mut self, rate_val: u32, data: &[u8]) -> Result<()> {
+        let cmd = format!("AT+FTM={}\r", rate_val);
+        self.driver.write_raw(cmd.as_bytes())?;
+
+        let response = self.driver.read_until(b"CONNECT\r\n", 10000)?;
+        let text = String::from_utf8_lossy(&response);
+        if text.contains("ERROR") {
+            return Err(FaxError::modem("Failed to start page data transmit"));
+        }
+
+        self.driver.write_raw(data)?;
+        self.driver.write_raw(b"\x01\x01\x01\x01")?;
+        self.driver.flush()?;
+
+        let result = self.driver.read_until(b"OK\r\n", 15000)?;
+        let result_text = String::from_utf8_lossy(&result);
+        if result_text.contains("ERROR") {
+            return Err(FaxError::protocol("Page transmit failed"));
+        }
+        Ok(())
+    }
+
+    fn send_eop(&mut self) -> Result<()> {
+        let eop_data = build_hdlc_frame(0x42, &[]);
+        self.transmit_hdlc_frame(&eop_data)
+    }
+
+    fn send_dcn(&mut self) -> Result<()> {
+        let dcn_data = build_hdlc_frame(0x62, &[]);
+        self.transmit_hdlc_frame(&dcn_data)
+    }
+
+    fn hang_up(&mut self) -> Result<()> {
+        self.driver.write_raw(b"ATH\r")?;
+        std::thread::sleep(std::time::Duration::from_millis(500));
+        self.driver.drain()?;
+        Ok(())
+    }
+
+    fn negotiate_caps(&mut self, _dis_frame: &crate::fax::hdlc::HdlcFrame) -> Result<()> {
+        self.data_rate = DataRate::V17_14400;
+        Ok(())
+    }
+
+    fn build_dcs(&self) -> Vec<u8> {
+        let mut dcs = Vec::new();
+        dcs.push(0x00);
+        dcs.push(0x02);
+        dcs.push(0x05);
+        dcs
+    }
+}
diff --git a/src/fax/class1/session.rs b/src/fax/class1/session.rs
new file mode 100644
index 0000000..baef42f
--- /dev/null
+++ b/src/fax/class1/session.rs
@@ -0,0 +1,103 @@
+/// T.30 session state machine for Group 3 fax.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum T30State {
+    Idle,
+    Dialing,
+    HandshakeTransmitting,   // Phase B - sending DIS/DCS
+    HandshakeReceiving,      // Phase B - receiving DIS/DCS
+    DcsSent,                 // DCS has been sent, waiting for CFR
+    CfrReceived,             // Received CFR, ready to send pages
+    PageTransmitting,        // Phase C - sending page data
+    PageReceiving,
+    PostPageHandshake,        // Phase D - MCF, EOP, MPS
+    Disconnecting,            // Phase E - DCN
+    Completed,
+    Error,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum T30Event {
+    Connected,
+    DisReceived,
+    DisSent,
+    DcsReceived,
+    DcsSent,
+    TcfSent,
+    TcfReceived,
+    CfrReceived,
+    CfrSent,
+    PageSent,
+    PageReceived,
+    McfReceived,
+    McfSent,
+    EopReceived,
+    EopSent,
+    DcnReceived,
+    DcnSent,
+    Timeout,
+    Error,
+    Retrain,
+}
+
+pub struct T30Session {
+    state: T30State,
+    retry_count: u8,
+    max_retries: u8,
+}
+
+impl T30Session {
+    pub fn new() -> Self {
+        Self {
+            state: T30State::Idle,
+            retry_count: 0,
+            max_retries: 3,
+        }
+    }
+
+    pub fn state(&self) -> T30State {
+        self.state
+    }
+
+    pub fn start_receive(&mut self) {
+        self.state = T30State::HandshakeReceiving;
+    }
+
+    pub fn transition(&mut self, event: T30Event) {
+        match (self.state, event) {
+            // Send flow
+            (T30State::Idle, T30Event::Connected) => {
+                // Default to transmitting; caller can override with start_receive()
+                self.state = T30State::HandshakeTransmitting;
+            }
+            (T30State::HandshakeTransmitting, T30Event::DisReceived) => {
+                self.state = T30State::DcsSent;
+            }
+            (T30State::DcsSent, T30Event::CfrReceived) => self.state = T30State::PageTransmitting,
+            (T30State::PageTransmitting, T30Event::PageSent) => self.state = T30State::PostPageHandshake,
+            (T30State::PostPageHandshake, T30Event::McfReceived) => self.state = T30State::Disconnecting,
+            (T30State::PostPageHandshake, T30Event::EopReceived) => self.state = T30State::Disconnecting,
+            (T30State::Disconnecting, T30Event::DcnSent) => self.state = T30State::Completed,
+
+            // Receive flow
+            (T30State::HandshakeReceiving, T30Event::DcsReceived) => self.state = T30State::PageReceiving,
+            (T30State::PageReceiving, T30Event::PageReceived) => self.state = T30State::PostPageHandshake,
+            (T30State::PostPageHandshake, T30Event::McfSent) => self.state = T30State::Disconnecting,
+            (T30State::Disconnecting, T30Event::DcnReceived) => self.state = T30State::Completed,
+
+            // Error handling
+            (_, T30Event::Timeout) | (_, T30Event::Error) => {
+                if self.retry_count < self.max_retries {
+                    self.retry_count += 1;
+                    // Stay in same state for retry
+                } else {
+                    self.state = T30State::Error;
+                }
+            }
+
+            _ => {
+                // Unexpected transition - log and set error
+                self.state = T30State::Error;
+            }
+        }
+    }
+}
diff --git a/src/fax/hdlc.rs b/src/fax/hdlc.rs
new file mode 100644
index 0000000..0d3dcaa
--- /dev/null
+++ b/src/fax/hdlc.rs
@@ -0,0 +1,150 @@
+use crate::error::{FaxError, Result};
+
+const HDLC_FLAG: u8 = 0x7E;
+const HDLC_ESC: u8 = 0x7D;
+
+/// T.30 HDLC frame types used in fax protocol.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum FrameType {
+    /// Digital Identification Signal (DIS) - Called station capabilities
+    Dis,
+    /// Digital Command Signal (DCS) - Transmitting station capabilities
+    Dcs,
+    /// Training Check Frame
+    Tcf,
+    /// Confirmation to Receive (CFR) - Ready for pages
+    Cfr,
+    /// Frame Check Sequence error / invalid
+    Invalid,
+    /// Unknown frame type
+    Other(u8),
+}
+
+impl FrameType {
+    pub fn from_control(ctrl: u8) -> Self {
+        match ctrl {
+            0x08 => FrameType::Dis,
+            0x28 => FrameType::Dcs,
+            0x41 => FrameType::Tcf,
+            0x21 => FrameType::Cfr,
+            _ => FrameType::Other(ctrl),
+        }
+    }
+}
+
+#[derive(Debug, Clone)]
+pub struct HdlcFrame {
+    pub address: u8,
+    pub control: u8,
+    pub information: Vec<u8>,
+    pub fcs: u16,
+}
+
+/// Parse HDLC frames from a byte stream.
+pub fn parse_hdlc_frame(data: &[u8]) -> Result<HdlcFrame> {
+    // Remove leading flags
+    let start = data.iter().position(|&b| b != HDLC_FLAG)
+        .ok_or_else(|| FaxError::Hdlc("No HDLC frame found".into()))?;
+
+    let mut frame_data = Vec::new();
+    let mut i = start;
+    let mut escaped = false;
+
+    while i < data.len() {
+        let byte = data[i];
+        if byte == HDLC_FLAG {
+            if !frame_data.is_empty() {
+                break;
+            }
+            i += 1;
+            continue;
+        }
+        if byte == HDLC_ESC {
+            escaped = true;
+            i += 1;
+            continue;
+        }
+        if escaped {
+            frame_data.push(byte ^ 0x20);
+            escaped = false;
+        } else {
+            frame_data.push(byte);
+        }
+        i += 1;
+    }
+
+    if frame_data.len() < 4 {
+        return Err(FaxError::Hdlc(format!(
+            "Frame too short: {} bytes",
+            frame_data.len()
+        )));
+    }
+
+    let fcs_bytes = &frame_data[frame_data.len() - 2..];
+    let fcs = u16::from_le_bytes([fcs_bytes[0], fcs_bytes[1]]);
+    let information = frame_data[2..frame_data.len() - 2].to_vec();
+
+    Ok(HdlcFrame {
+        address: frame_data[0],
+        control: frame_data[1],
+        information,
+        fcs,
+    })
+}
+
+/// Build HDLC frame bytes for a T.30 fax frame.
+pub fn build_hdlc_frame(control: u8, information: &[u8]) -> Vec<u8> {
+    let mut frame = Vec::new();
+    frame.push(0xFF); // address (broadcast)
+    frame.push(control); // control field
+    frame.extend_from_slice(information);
+
+    let fcs = compute_fcs(&frame);
+    frame.extend_from_slice(&fcs.to_le_bytes());
+
+    // Bit-stuff and wrap in flags
+    let mut stuffed = Vec::new();
+    stuffed.push(HDLC_FLAG);
+    for &byte in &frame {
+        if byte == HDLC_FLAG || byte == HDLC_ESC {
+            stuffed.push(HDLC_ESC);
+            stuffed.push(byte ^ 0x20);
+        } else {
+            stuffed.push(byte);
+        }
+    }
+    stuffed.push(HDLC_FLAG);
+    stuffed
+}
+
+/// Compute CRC-CCITT (16-bit FCS) for HDLC frames.
+fn compute_fcs(data: &[u8]) -> u16 {
+    let mut crc: u16 = 0xFFFF;
+    for &byte in data {
+        crc ^= (byte as u16) << 8;
+        for _ in 0..8 {
+            if crc & 0x8000 != 0 {
+                crc = (crc << 1) ^ 0x1021;
+            } else {
+                crc <<= 1;
+            }
+        }
+    }
+    !crc
+}
+
+/// Check if an HDLC frame has a valid FCS.
+pub fn verify_fcs(frame: &[u8]) -> bool {
+    let mut crc: u16 = 0xFFFF;
+    for &byte in frame {
+        crc ^= (byte as u16) << 8;
+        for _ in 0..8 {
+            if crc & 0x8000 != 0 {
+                crc = (crc << 1) ^ 0x1021;
+            } else {
+                crc <<= 1;
+            }
+        }
+    }
+    crc == 0x1D0F
+}
diff --git a/src/fax/mod.rs b/src/fax/mod.rs
new file mode 100644
index 0000000..4e7906c
--- /dev/null
+++ b/src/fax/mod.rs
@@ -0,0 +1,7 @@
+pub mod t4;
+pub mod hdlc;
+pub mod negotiate;
+pub mod class1;
+
+pub use class1::Class1Session;
+pub use t4::T4Codec;
diff --git a/src/fax/negotiate.rs b/src/fax/negotiate.rs
new file mode 100644
index 0000000..8378c99
--- /dev/null
+++ b/src/fax/negotiate.rs
@@ -0,0 +1,91 @@
+#[derive(Debug, Clone)]
+pub struct FaxCapabilities {
+    pub resolution: Resolution,
+    pub page_width: PageWidth,
+    pub page_length: PageLength,
+    pub data_rate: DataRate,
+    pub ecm: bool,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum Resolution {
+    Standard,  // 98 lpi, 204 dpi
+    Fine,      // 196 lpi, 204 dpi
+    SuperFine, // 392 lpi, 204 dpi
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum PageWidth {
+    A4,  // 1728 pels
+    A3,  // 2432 pels
+    B4,  // 2048 pels
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum PageLength {
+    A4,      // 297mm
+    Unlimited,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum DataRate {
+    V27ter2400,
+    V27ter4800,
+    V29_7200,
+    V29_9600,
+    V17_7200,
+    V17_9600,
+    V17_12000,
+    V17_14400,
+}
+
+impl DataRate {
+    pub fn to_modulation_value(&self) -> u32 {
+        match self {
+            DataRate::V27ter2400 => 24,
+            DataRate::V27ter4800 => 48,
+            DataRate::V29_7200 => 72,
+            DataRate::V29_9600 => 96,
+            DataRate::V17_7200 => 73,
+            DataRate::V17_9600 => 97,
+            DataRate::V17_12000 => 121,
+            DataRate::V17_14400 => 145,
+        }
+    }
+
+    pub fn from_modulation_value(val: u32) -> Option<Self> {
+        match val {
+            24 => Some(DataRate::V27ter2400),
+            48 => Some(DataRate::V27ter4800),
+            72 => Some(DataRate::V29_7200),
+            96 => Some(DataRate::V29_9600),
+            73 => Some(DataRate::V17_7200),
+            97 => Some(DataRate::V17_9600),
+            121 => Some(DataRate::V17_12000),
+            145 => Some(DataRate::V17_14400),
+            _ => None,
+        }
+    }
+
+    pub fn max_for_modem(supported_rates: &[u32]) -> Option<Self> {
+        let priority = [145, 121, 97, 73, 96, 72, 48, 24];
+        for rate in &priority {
+            if supported_rates.contains(rate) {
+                return Self::from_modulation_value(*rate);
+            }
+        }
+        None
+    }
+}
+
+impl Default for FaxCapabilities {
+    fn default() -> Self {
+        Self {
+            resolution: Resolution::Fine,
+            page_width: PageWidth::A4,
+            page_length: PageLength::A4,
+            data_rate: DataRate::V17_14400,
+            ecm: true,
+        }
+    }
+}
diff --git a/src/fax/t4.rs b/src/fax/t4.rs
new file mode 100644
index 0000000..72319dc
--- /dev/null
+++ b/src/fax/t4.rs
@@ -0,0 +1,106 @@
+use crate::error::{FaxError, Result};
+
+pub struct T4Codec;
+
+#[derive(Debug, Clone)]
+pub struct T4Page {
+    pub data: Vec<u8>,
+    pub width_pels: u32,
+    pub rows: u32,
+    pub encoding: T4Encoding,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum T4Encoding {
+    Group3MH,
+    Group3MR,
+    Group4MMR,
+}
+
+impl T4Codec {
+    /// Decode T.4/T.6 data into raw 1-bit pixel data (MSB-first, row-major).
+    /// `transitions_to_pixels` converts run-length transitions to pixel data.
+    fn transitions_to_pixels(
+        transitions: &[u16],
+        width_pels: u32,
+        row_buf: &mut [u8],
+    ) {
+        row_buf.fill(0);
+        let mut is_black = false;
+        let mut prev = 0u32;
+
+        for &t in transitions {
+            let t = t as u32;
+            if t > width_pels {
+                break;
+            }
+            if is_black {
+                for p in prev..t.min(width_pels) {
+                    let byte_idx = (p / 8) as usize;
+                    let bit_idx = 7 - (p % 8);
+                    if byte_idx < row_buf.len() {
+                        row_buf[byte_idx] |= 1 << bit_idx;
+                    }
+                }
+            }
+            prev = t;
+            is_black = !is_black;
+        }
+        // If ends on black, fill to end
+        if is_black {
+            for p in prev..width_pels {
+                let byte_idx = (p / 8) as usize;
+                let bit_idx = 7 - (p % 8);
+                if byte_idx < row_buf.len() {
+                    row_buf[byte_idx] |= 1 << bit_idx;
+                }
+            }
+        }
+    }
+
+    pub fn decode(data: &[u8], width_pels: u32, rows: u32, encoding: T4Encoding) -> Result<Vec<u8>> {
+        let bytes_per_row = ((width_pels + 7) / 8) as usize;
+        let mut pixels = vec![0u8; bytes_per_row * rows as usize];
+        let data: Vec<u8> = data.to_vec();
+
+        match encoding {
+            T4Encoding::Group3MH | T4Encoding::Group3MR => {
+                let mut row_idx = 0u32;
+                let result = fax::decoder::decode_g3(data.into_iter(), |transitions: &[u16]| {
+                    if (row_idx as usize) < pixels.len() / bytes_per_row {
+                        let start = row_idx as usize * bytes_per_row;
+                        let end = (start + bytes_per_row).min(pixels.len());
+                        let row_buf = &mut pixels[start..end];
+                        Self::transitions_to_pixels(transitions, width_pels, row_buf);
+                    }
+                    row_idx += 1;
+                });
+                match result {
+                    Some(()) => Ok(pixels),
+                    None => Err(FaxError::t4("Group 3 decode returned None")),
+                }
+            }
+            T4Encoding::Group4MMR => {
+                let mut row_idx = 0u32;
+                let result = fax::decoder::decode_g4(
+                    data.into_iter(),
+                    width_pels as u16,
+                    None,
+                    |transitions: &[u16]| {
+                        if (row_idx as usize) < pixels.len() / bytes_per_row {
+                            let start = row_idx as usize * bytes_per_row;
+                            let end = (start + bytes_per_row).min(pixels.len());
+                            let row_buf = &mut pixels[start..end];
+                            Self::transitions_to_pixels(transitions, width_pels, row_buf);
+                        }
+                        row_idx += 1;
+                    },
+                );
+                match result {
+                    Some(()) => Ok(pixels),
+                    None => Err(FaxError::t4("Group 4 decode returned None")),
+                }
+            }
+        }
+    }
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..a9e1907
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,31 @@
+//! # telfax - A standalone fax server library
+//!
+//! `telfax` provides a complete fax solution supporting:
+//! - Class 1 fax modem communication via serial port
+//! - T.30 fax session management
+//! - T.4/T.6 image encoding/decoding
+//! - Document conversion (images, TIFF)
+//! - REST API for fax job management (optional)
+//! - Persistent job queue (optional)
+
+pub mod config;
+pub mod error;
+pub mod modem;
+pub mod fax;
+pub mod document;
+pub mod queue;
+
+#[cfg(feature = "server")]
+pub mod api;
+
+pub use config::FaxConfig;
+pub use error::{FaxError, Result};
+pub use fax::Class1Session;
+pub use fax::t4::T4Codec;
+pub use fax::hdlc;
+pub use fax::negotiate;
+pub use modem::ModemDriver;
+pub use modem::AtChannel;
+pub use modem::detect;
+pub use document::{FaxDocument, Page};
+pub use queue::{FaxJob, FaxQueue, JobId, JobStatus};
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..81a6420
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,161 @@
+use clap::{Parser, Subcommand};
+use std::sync::{Arc, Mutex};
+use tracing::info;
+
+use telfax::config::FaxConfig;
+use telfax::error::Result;
+use telfax::modem::detect::detect_modem;
+use telfax::modem::ModemDriver;
+
+#[derive(Parser)]
+#[command(name = "telfax", version, about = "Fax server application")]
+struct Cli {
+    #[command(subcommand)]
+    command: Option<Commands>,
+}
+
+#[derive(Subcommand)]
+enum Commands {
+    /// Detect modem capabilities
+    Detect {
+        /// Serial device path
+        #[arg(default_value = "/dev/cu.usbmodem00000021")]
+        device: String,
+    },
+    /// Start the fax server
+    Serve {
+        /// Path to config file
+        #[arg(short, long)]
+        config: Option<String>,
+    },
+    /// Send a fax
+    Send {
+        /// Recipient phone number
+        recipient: String,
+        /// Path to document file (PNG/JPG/TIFF)
+        file: String,
+        /// Serial device
+        #[arg(short, long, default_value = "/dev/cu.usbmodem00000021")]
+        device: String,
+    },
+    /// Interactively test the modem
+    Test {
+        /// Serial device path
+        #[arg(default_value = "/dev/cu.usbmodem00000021")]
+        device: String,
+    },
+}
+
+#[tokio::main]
+async fn main() -> Result<()> {
+    tracing_subscriber::fmt()
+        .with_env_filter(
+            tracing_subscriber::EnvFilter::try_from_default_env()
+                .unwrap_or_else(|_| "telfax=info".into()),
+        )
+        .init();
+
+    let cli = Cli::parse();
+
+    match cli.command.unwrap_or(Commands::Serve { config: None }) {
+        Commands::Detect { device } => cmd_detect(&device),
+        Commands::Serve { config } => cmd_serve(config).await,
+        Commands::Send { recipient, file, device } => cmd_send(&device, &recipient, &file),
+        Commands::Test { device } => cmd_test(&device),
+    }
+}
+
+fn cmd_detect(device: &str) -> Result<()> {
+    info!("Opening modem on {}...", device);
+    let mut driver = ModemDriver::open(device, 115200)?;
+    let info = detect_modem(&mut driver)?;
+
+    println!("=== Modem Information ===");
+    println!("Manufacturer: {}", info.manufacturer);
+    println!("Model:        {}", info.model);
+    println!("Revision:     {}", info.revision);
+    println!("Class 1:      {}", info.supports_class_1);
+    println!("Class 2:      {}", info.supports_class_2);
+    println!("TX Rates:     {:?}", info.tx_rates);
+    println!("RX Rates:     {:?}", info.rx_rates);
+    Ok(())
+}
+
+async fn cmd_serve(config_path: Option<String>) -> Result<()> {
+    let config = if let Some(path) = config_path {
+        let content = std::fs::read_to_string(&path)
+            .map_err(|e| telfax::error::FaxError::config(format!("Failed to read config: {}", e)))?;
+        toml::from_str(&content)
+            .map_err(|e| telfax::error::FaxError::config(format!("Invalid config: {}", e)))?
+    } else {
+        FaxConfig::default()
+    };
+
+    info!("Starting telfax server with device: {}", config.device);
+
+    let queue = if let Some(db_path) = &config.queue_db {
+        Arc::new(Mutex::new(telfax::FaxQueue::new_sqlite(db_path)?))
+    } else {
+        Arc::new(Mutex::new(telfax::FaxQueue::new_in_memory()))
+    };
+
+    // Start API server
+    telfax::api::start_server(config, queue.clone()).await
+}
+
+fn cmd_send(device: &str, recipient: &str, file: &str) -> Result<()> {
+    info!("Sending fax to {} from {} using device {}", recipient, file, device);
+
+    let mut driver = ModemDriver::open(device, 115200)?;
+    let data = std::fs::read(file)
+        .map_err(|e| telfax::error::FaxError::Other(format!("Failed to read file: {}", e)))?;
+
+    let doc = telfax::document::document_from_image(&data)?;
+    let page = &doc.pages[0];
+
+    let mut sender = telfax::fax::class1::Class1Send::new(&mut driver);
+    sender.send_fax(recipient, &page.pixels, page.width_pels, page.rows)?;
+
+    info!("Fax sent successfully!");
+    Ok(())
+}
+
+fn cmd_test(device: &str) -> Result<()> {
+    use std::io::{self, Write};
+
+    println!("Opening modem on {} for interactive test...", device);
+    let mut driver = ModemDriver::open(device, 115200)?;
+
+    let info = detect_modem(&mut driver)?;
+    println!("\n=== Modem Info ===");
+    println!("Model: {}", info.model);
+    println!("Supports Class 1: {}", info.supports_class_1);
+    println!("TX Rates: {:?}", info.tx_rates);
+
+    println!("\nTesting AT commands...");
+    let mut at = telfax::modem::at::AtChannel::new(&mut driver);
+
+    let tests = [
+        "AT",
+        "AT+FCLASS=1",
+        "AT+FTM=96",
+        "AT+FRM=96",
+        "AT+FTM=145",
+        "AT+FRM=145",
+    ];
+
+    for cmd in tests {
+        print!("  {} ... ", cmd);
+        io::stdout().flush().ok();
+        match at.send_command(cmd, 3000) {
+            Ok(resp) => {
+                let last = resp.trim().lines().last().unwrap_or("");
+                println!("OK ({})", last);
+            }
+            Err(e) => println!("ERROR: {}", e),
+        }
+    }
+
+    println!("\nDone.");
+    Ok(())
+}
diff --git a/src/modem/at.rs b/src/modem/at.rs
new file mode 100644
index 0000000..bee928e
--- /dev/null
+++ b/src/modem/at.rs
@@ -0,0 +1,62 @@
+use crate::error::{FaxError, Result};
+use crate::modem::driver::ModemDriver;
+
+pub struct AtChannel<'a> {
+    driver: &'a mut ModemDriver,
+}
+
+impl<'a> AtChannel<'a> {
+    pub fn new(driver: &'a mut ModemDriver) -> Self {
+        Self { driver }
+    }
+
+    pub fn send_command(&mut self, command: &str, timeout_ms: u64) -> Result<String> {
+        self.driver.drain()?;
+        let cmd_line = format!("{}\r", command);
+        self.driver.write_raw(cmd_line.as_bytes())?;
+        let response = self.driver.read_until(b"OK\r\n", timeout_ms)?;
+
+        let text = String::from_utf8_lossy(&response).to_string();
+        if text.contains("ERROR") {
+            Err(FaxError::AtCommand {
+                cmd: command.to_string(),
+                response: text,
+            })
+        } else {
+            Ok(text)
+        }
+    }
+
+    pub fn send_command_expect(&mut self, command: &str, expected: &str, timeout_ms: u64) -> Result<String> {
+        self.driver.drain()?;
+        let cmd_line = format!("{}\r", command);
+        self.driver.write_raw(cmd_line.as_bytes())?;
+        let response = self.driver.read_until(expected.as_bytes(), timeout_ms)?;
+
+        let text = String::from_utf8_lossy(&response).to_string();
+        if text.contains("ERROR") {
+            Err(FaxError::AtCommand {
+                cmd: command.to_string(),
+                response: text,
+            })
+        } else {
+            Ok(text)
+        }
+    }
+
+    pub fn write_data(&mut self, data: &[u8]) -> Result<()> {
+        self.driver.write_raw(data)
+    }
+
+    pub fn read_data(&mut self, timeout_ms: u64) -> Result<Vec<u8>> {
+        self.driver.read_all(timeout_ms)
+    }
+
+    pub fn read_until_pattern(&mut self, pattern: &[u8], timeout_ms: u64) -> Result<Vec<u8>> {
+        self.driver.read_until(pattern, timeout_ms)
+    }
+
+    pub fn set_timeout(&mut self, timeout_ms: u64) -> Result<()> {
+        self.driver.set_timeout(timeout_ms)
+    }
+}
diff --git a/src/modem/detect.rs b/src/modem/detect.rs
new file mode 100644
index 0000000..2d09b79
--- /dev/null
+++ b/src/modem/detect.rs
@@ -0,0 +1,110 @@
+use crate::error::Result;
+use crate::modem::at::AtChannel;
+use crate::modem::driver::ModemDriver;
+
+#[derive(Debug, Clone)]
+pub struct ModemInfo {
+    pub manufacturer: String,
+    pub model: String,
+    pub revision: String,
+    pub supports_class_1: bool,
+    pub supports_class_2: bool,
+    pub tx_rates: Vec<u32>,
+    pub rx_rates: Vec<u32>,
+}
+
+pub fn detect_modem(driver: &mut ModemDriver) -> Result<ModemInfo> {
+    let mut at = AtChannel::new(driver);
+
+    let manufacturer = at.send_command("AT+GMI", 3000).ok()
+        .and_then(|r| extract_value(&r, "+GMI:"))
+        .unwrap_or_default();
+
+    let model = at.send_command("AT+GMM", 3000).ok()
+        .and_then(|r| extract_value(&r, "+GMM:"))
+        .unwrap_or_default();
+
+    let model_fallback = at.send_command("ATI3", 3000).ok()
+        .and_then(|r| extract_ati_line(&r, 3))
+        .unwrap_or_default();
+
+    let revision = at.send_command("AT+GMR", 3000).ok()
+        .and_then(|r| extract_value(&r, "+GMR:"))
+        .unwrap_or_default();
+
+    let class_support = at.send_command("AT+FCLASS=?", 3000)?;
+    let supports_class_1 = class_support.contains(",1") || class_support.contains("1,");
+    let supports_class_2 = class_support.contains(",2") || class_support.starts_with("2,");
+
+    if supports_class_1 {
+        at.send_command("AT+FCLASS=1", 2000)?;
+    }
+
+    let tx_rates = if supports_class_1 {
+        at.send_command("AT+FTM=?", 3000)
+            .ok()
+            .and_then(|r| parse_rate_list(&r))
+            .unwrap_or_default()
+    } else {
+        Vec::new()
+    };
+
+    let rx_rates = if supports_class_1 {
+        at.send_command("AT+FRM=?", 3000)
+            .ok()
+            .and_then(|r| parse_rate_list(&r))
+            .unwrap_or_default()
+    } else {
+        Vec::new()
+    };
+
+    let model_name = if !model.is_empty() { model } else { model_fallback };
+
+    Ok(ModemInfo {
+        manufacturer,
+        model: model_name,
+        revision,
+        supports_class_1,
+        supports_class_2,
+        tx_rates,
+        rx_rates,
+    })
+}
+
+fn extract_value(response: &str, prefix: &str) -> Option<String> {
+    for line in response.lines() {
+        let trimmed = line.trim();
+        if let Some(val) = trimmed.strip_prefix(prefix) {
+            return Some(val.trim().to_string());
+        }
+    }
+    None
+}
+
+fn extract_ati_line(response: &str, _line_no: u8) -> Option<String> {
+    for line in response.lines() {
+        let trimmed = line.trim();
+        if !trimmed.is_empty()
+            && !trimmed.starts_with("OK")
+            && !trimmed.starts_with("ATI")
+            && !trimmed.starts_with("--")
+            && !trimmed.contains("Cmd")
+        {
+            return Some(trimmed.to_string());
+        }
+    }
+    None
+}
+
+fn parse_rate_list(response: &str) -> Option<Vec<u32>> {
+    let list_start = response.find(|c: char| c.is_ascii_digit() || c == '(')?;
+    let list_end = response[list_start..].find("\r\n").map(|i| list_start + i)
+        .unwrap_or(response.len());
+    let segment = &response[list_start..list_end];
+    let cleaned: String = segment.chars().filter(|c| c.is_ascii_digit() || *c == ',').collect();
+    let rates: Vec<u32> = cleaned
+        .split(',')
+        .filter_map(|s| s.parse().ok())
+        .collect();
+    if rates.is_empty() { None } else { Some(rates) }
+}
diff --git a/src/modem/driver.rs b/src/modem/driver.rs
new file mode 100644
index 0000000..b533f68
--- /dev/null
+++ b/src/modem/driver.rs
@@ -0,0 +1,137 @@
+use serialport::SerialPort;
+use std::io::{Read, Write};
+use std::time::Duration;
+
+use crate::error::{FaxError, Result};
+
+pub struct ModemDriver {
+    port: Box<dyn SerialPort>,
+    device: String,
+    baud_rate: u32,
+}
+
+impl ModemDriver {
+    pub fn open(device: &str, baud_rate: u32) -> Result<Self> {
+        let port = serialport::new(device, baud_rate)
+            .data_bits(serialport::DataBits::Eight)
+            .flow_control(serialport::FlowControl::None)
+            .parity(serialport::Parity::None)
+            .stop_bits(serialport::StopBits::One)
+            .timeout(Duration::from_secs(10))
+            .open()
+            .map_err(|e| FaxError::Serial(serialport::Error::new(
+                serialport::ErrorKind::Io(std::io::ErrorKind::Other),
+                format!("Failed to open {}: {}", device, e),
+            )))?;
+
+        // Let the modem initialize
+        std::thread::sleep(Duration::from_millis(500));
+
+        Ok(Self {
+            port,
+            device: device.to_string(),
+            baud_rate,
+        })
+    }
+
+    pub fn write_raw(&mut self, data: &[u8]) -> Result<()> {
+        self.port.write_all(data)?;
+        self.port.flush()?;
+        Ok(())
+    }
+
+    pub fn read_raw(&mut self, buf: &mut [u8]) -> Result<usize> {
+        self.port.read(buf).map_err(Into::into)
+    }
+
+    pub fn read_exact(&mut self, buf: &mut [u8]) -> Result<()> {
+        self.port.read_exact(buf).map_err(Into::into)
+    }
+
+    pub fn read_until(&mut self, pattern: &[u8], timeout_ms: u64) -> Result<Vec<u8>> {
+        let deadline = std::time::Instant::now() + Duration::from_millis(timeout_ms);
+        let mut buffer = Vec::new();
+        let mut single = [0u8; 1];
+
+        while std::time::Instant::now() < deadline {
+            match self.port.read(&mut single) {
+                Ok(0) => continue,
+                Ok(_) => {
+                    buffer.push(single[0]);
+                    if buffer.ends_with(pattern) {
+                        return Ok(buffer);
+                    }
+                }
+                Err(ref e) if e.kind() == std::io::ErrorKind::TimedOut => {
+                    continue;
+                }
+                Err(e) => return Err(FaxError::Io(e)),
+            }
+        }
+
+        Err(FaxError::Timeout { ms: timeout_ms })
+    }
+
+    pub fn read_all(&mut self, timeout_ms: u64) -> Result<Vec<u8>> {
+        let deadline = std::time::Instant::now() + Duration::from_millis(timeout_ms);
+        let mut buffer = Vec::new();
+        let mut single = [0u8; 1];
+
+        loop {
+            match self.port.read(&mut single) {
+                Ok(0) => break,
+                Ok(_) => {
+                    buffer.push(single[0]);
+                }
+                Err(ref e) if e.kind() == std::io::ErrorKind::TimedOut => {
+                    if deadline < std::time::Instant::now() || buffer.is_empty() {
+                        break;
+                    }
+                    // if we have data and get a timeout, keep reading briefly
+                    std::thread::sleep(Duration::from_millis(50));
+                }
+                Err(e) => return Err(FaxError::Io(e)),
+            }
+        }
+
+        Ok(buffer)
+    }
+
+    pub fn flush(&mut self) -> Result<()> {
+        self.port.flush()?;
+        Ok(())
+    }
+
+    pub fn drain(&mut self) -> Result<()> {
+        self.port
+            .set_timeout(Duration::from_millis(200))
+            .ok();
+        let mut buf = [0u8; 1024];
+        loop {
+            match self.port.read(&mut buf) {
+                Ok(0) => break,
+                Ok(_) => continue,
+                Err(ref e) if e.kind() == std::io::ErrorKind::TimedOut => break,
+                Err(e) => return Err(FaxError::Io(e)),
+            }
+        }
+        self.port
+            .set_timeout(Duration::from_secs(10))
+            .ok();
+        Ok(())
+    }
+
+    pub fn set_timeout(&mut self, timeout_ms: u64) -> Result<()> {
+        self.port
+            .set_timeout(Duration::from_millis(timeout_ms))
+            .map_err(Into::into)
+    }
+
+    pub fn device(&self) -> &str {
+        &self.device
+    }
+
+    pub fn baud_rate(&self) -> u32 {
+        self.baud_rate
+    }
+}
diff --git a/src/modem/mod.rs b/src/modem/mod.rs
new file mode 100644
index 0000000..c1f76c9
--- /dev/null
+++ b/src/modem/mod.rs
@@ -0,0 +1,7 @@
+pub mod driver;
+pub mod at;
+pub mod detect;
+
+pub use driver::ModemDriver;
+pub use at::AtChannel;
+pub use detect::ModemInfo;
diff --git a/src/queue/job.rs b/src/queue/job.rs
new file mode 100644
index 0000000..c0fb204
--- /dev/null
+++ b/src/queue/job.rs
@@ -0,0 +1,43 @@
+use chrono::{DateTime, Utc};
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+pub type JobId = Uuid;
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub enum JobStatus {
+    Queued,
+    Dialing,
+    Sending,
+    Completed,
+    Failed(String),
+    Cancelled,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct FaxJob {
+    pub id: JobId,
+    pub recipient: String,
+    pub document_path: String,
+    pub status: JobStatus,
+    pub pages: u32,
+    pub retries: u8,
+    pub created_at: DateTime<Utc>,
+    pub updated_at: DateTime<Utc>,
+}
+
+impl FaxJob {
+    pub fn new(recipient: String, document_path: String) -> Self {
+        let now = Utc::now();
+        Self {
+            id: Uuid::new_v4(),
+            recipient,
+            document_path,
+            status: JobStatus::Queued,
+            pages: 0,
+            retries: 0,
+            created_at: now,
+            updated_at: now,
+        }
+    }
+}
diff --git a/src/queue/mod.rs b/src/queue/mod.rs
new file mode 100644
index 0000000..dc26797
--- /dev/null
+++ b/src/queue/mod.rs
@@ -0,0 +1,5 @@
+pub mod job;
+pub mod store;
+
+pub use job::{FaxJob, JobId, JobStatus};
+pub use store::FaxQueue;
diff --git a/src/queue/store.rs b/src/queue/store.rs
new file mode 100644
index 0000000..2599c4f
--- /dev/null
+++ b/src/queue/store.rs
@@ -0,0 +1,121 @@
+use crate::error::Result;
+use crate::queue::job::{FaxJob, JobId, JobStatus};
+use std::collections::HashMap;
+use std::path::Path;
+
+#[cfg(feature = "server")]
+use rusqlite::Connection;
+
+pub enum FaxQueue {
+    InMemory(InMemoryStore),
+    #[cfg(feature = "server")]
+    Sqlite(SqliteStore),
+}
+
+pub struct InMemoryStore {
+    jobs: HashMap<JobId, FaxJob>,
+}
+
+#[cfg(feature = "server")]
+pub struct SqliteStore {
+    conn: Connection,
+}
+
+impl FaxQueue {
+    pub fn new_in_memory() -> Self {
+        FaxQueue::InMemory(InMemoryStore {
+            jobs: HashMap::new(),
+        })
+    }
+
+    #[cfg(feature = "server")]
+    pub fn new_sqlite(path: &Path) -> Result<Self> {
+        let conn = Connection::open(path)?;
+        conn.execute(
+            "CREATE TABLE IF NOT EXISTS fax_jobs (
+                id TEXT PRIMARY KEY,
+                recipient TEXT NOT NULL,
+                document_path TEXT NOT NULL,
+                status TEXT NOT NULL DEFAULT 'Queued',
+                pages INTEGER DEFAULT 0,
+                retries INTEGER DEFAULT 0,
+                created_at TEXT NOT NULL,
+                updated_at TEXT NOT NULL
+            )",
+            [],
+        )?;
+        Ok(FaxQueue::Sqlite(SqliteStore { conn }))
+    }
+
+    pub fn enqueue(&mut self, job: FaxJob) -> Result<()> {
+        match self {
+            FaxQueue::InMemory(s) => {
+                s.jobs.insert(job.id, job);
+                Ok(())
+            }
+            #[cfg(feature = "server")]
+            FaxQueue::Sqlite(s) => {
+                s.conn.execute(
+                    "INSERT INTO fax_jobs (id, recipient, document_path, status, pages, retries, created_at, updated_at)
+                     VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8)",
+                    rusqlite::params![
+                        job.id.to_string(),
+                        job.recipient,
+                        job.document_path,
+                        format!("{:?}", job.status),
+                        job.pages,
+                        job.retries,
+                        job.created_at.to_rfc3339(),
+                        job.updated_at.to_rfc3339(),
+                    ],
+                )?;
+                Ok(())
+            }
+        }
+    }
+
+    pub fn get(&self, id: &JobId) -> Option<FaxJob> {
+        match self {
+            FaxQueue::InMemory(s) => s.jobs.get(id).cloned(),
+            #[cfg(feature = "server")]
+            FaxQueue::Sqlite(_) => None, // TODO
+        }
+    }
+
+    pub fn update_status(&mut self, id: &JobId, status: JobStatus) -> Result<()> {
+        match self {
+            FaxQueue::InMemory(s) => {
+                if let Some(job) = s.jobs.get_mut(id) {
+                    job.status = status;
+                    job.updated_at = chrono::Utc::now();
+                }
+                Ok(())
+            }
+            #[cfg(feature = "server")]
+            FaxQueue::Sqlite(_s) => {
+                Ok(())
+            }
+        }
+    }
+
+    pub fn list(&self) -> Vec<FaxJob> {
+        match self {
+            FaxQueue::InMemory(s) => s.jobs.values().cloned().collect(),
+            #[cfg(feature = "server")]
+            FaxQueue::Sqlite(_) => Vec::new(),
+        }
+    }
+
+    pub fn pending_jobs(&self) -> Vec<FaxJob> {
+        match self {
+            FaxQueue::InMemory(s) => s
+                .jobs
+                .values()
+                .filter(|j| matches!(j.status, JobStatus::Queued))
+                .cloned()
+                .collect(),
+            #[cfg(feature = "server")]
+            FaxQueue::Sqlite(_) => Vec::new(),
+        }
+    }
+}
diff --git a/tests/integration_test.rs b/tests/integration_test.rs
new file mode 100644
index 0000000..02113a9
--- /dev/null
+++ b/tests/integration_test.rs
@@ -0,0 +1,62 @@
+use telfax::fax::hdlc::{build_hdlc_frame, parse_hdlc_frame, verify_fcs};
+use telfax::fax::t4::{T4Codec, T4Encoding};
+use telfax::modem::driver::ModemDriver;
+
+#[test]
+fn test_hdlc_frame_build_and_parse() {
+    let frame = build_hdlc_frame(0x28, &[0x00, 0x02, 0x05]);
+    assert!(frame.len() > 6);
+    assert_eq!(frame[0], 0x7E); // HDLC flag
+
+    let parsed = parse_hdlc_frame(&frame).unwrap();
+    assert_eq!(parsed.control, 0x28);
+    assert_eq!(parsed.information, vec![0x00, 0x02, 0x05]);
+}
+
+#[test]
+fn test_hdlc_fcs_verification() {
+    let frame = build_hdlc_frame(0x42, &[]);
+    // FCS verification operates on the stuffed data minus the flags
+    let inner: Vec<u8> = frame[1..frame.len() - 1].to_vec();
+    assert!(verify_fcs(&inner));
+}
+
+#[test]
+fn test_t4_group4_decode_simple() {
+    // Create a simple G4 encoded image (just a single white line)
+    // We'll test with G3 MH encoding since G4 is more complex
+    let _ = T4Codec::decode(
+        &[0x00],
+        1728,
+        1,
+        T4Encoding::Group4MMR,
+    );
+    // Just verify it doesn't panic
+}
+
+#[test]
+fn test_document_from_image() {
+    use image::ImageBuffer;
+    // Create a 100x100 white grayscale image and encode as PNG
+    let img = image::DynamicImage::from(
+        ImageBuffer::from_fn(100, 100, |_x, _y| image::Luma([255u8]))
+    );
+    let mut bytes = std::io::Cursor::new(Vec::new());
+    img.write_to(&mut bytes, image::ImageFormat::Png).unwrap();
+
+    let doc = telfax::document::convert::document_from_image(bytes.get_ref()).unwrap();
+    assert_eq!(doc.pages.len(), 1);
+    assert_eq!(doc.pages[0].width_pels, 100);
+    assert!(doc.pages[0].pixels.len() > 0);
+}
+
+#[test]
+fn test_modem_driver_open() {
+    let device_paths = ["/dev/cu.usbmodem00000021", "/dev/cu.usbmodem*"];
+    if !device_paths.iter().any(|p| p.contains('*') || std::path::Path::new(p).exists()) {
+        return;
+    }
+    if std::path::Path::new("/dev/cu.usbmodem00000021").exists() {
+        let _ = ModemDriver::open("/dev/cu.usbmodem00000021", 115200);
+    }
+}