SpechPhone
Modern SIP/VoIP Softphone written in PHP with Swoole
What is SpechPhone?
SpechPhone is a modern SIP/VoIP softphone written in PHP and optimized with Swoole. It supports inbound and outbound voice calls, SIP messaging, real-time audio bridging, and integrates with backend tools without depending on external media libraries or WebRTC.
Key Features
Self-sufficient
No FFmpeg or SoX required - all audio processing built-in
Multiple Codecs
Support for PCMA, PCMU, G.729, Opus, and L16
Audio Processing
Built-in resampling, mixing, noise suppression, and echo cancellation
Asynchronous I/O
Swoole coroutines for hundreds of simultaneous sessions
Full PHP Stack
SIP, RTP, and media control entirely in PHP
Browser Ready
Responsive HTML/JS interface with WebSocket support
Inbound Calls
Full SIP inbound flow with INVITE/ACK/CANCEL/BYE and RTP ↔ PCM media bridge
SIP Messaging
Integrated send/receive for SIP MESSAGE with real-time chat UI and history
Screenshots
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Dialer Interface - Phone keypad with call and volume controls
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Active Call - Real-time audio meters, minimized call bar, and hangup controls
Messaging Interface - SIP MESSAGE conversation list with real-time delivery
Mobile Call Interface - Active call screen with mute, volume, and keyboard controls
Mobile Floating Widget - Minimized active call overlay on home screen
Requirements
- Optimized PHP Runtime (pcg729) - Static PHP CLI with native G.729, Opus, and audio processing support
- OpenSSL for TLS/SSL features
- Linux or macOS system (recommended)
Installation
# Clone the repository
git clone https://github.com/spechshop/softphone && cd spechphone
# Download pcg729 runtime
wget https://github.com/spechshop/pcg729/releases/download/PCG729/php
sudo mv php /usr/local/bin/php
sudo chmod +x /usr/local/bin/php
# Initialize submodules
git submodule update --init --recursive
# Configure environment
cp .env.example .env
# Edit .env and set your SPECH_VAULT_KEY_HEX
# Start services (each in a separate terminal)
php server.php
php audio.phpArchitecture
Audio Processing
Through Swoole, the application opens a dedicated coroutine instance for each SIP trunk manager. This allows hundreds of calls to occur simultaneously without blocking the main process.
Security Model
- No WebRTC: SpechPhone doesn't use WebRTC (no SRTP / ICE / DTLS)
- Backend Media: Audio is transported via raw RTP (UDP)
- Thin Client: Browser acts as thin client via WebSocket (PCM delivery)
- Production: HTTPS and WSS are mandatory
What Can You Build?
- Enterprise Softphone with dialer and browser integration
- Proxy/SBC Client for SIP servers via UDP
- Audio Streaming via WebSocket or RTP
- Monitoring and Recording Services with native audio utilities
- Messaging Platform with SIP MESSAGE and real-time chat interface