RustPBX
April 30, 2026 · View on GitHub
A high-performance Software-Defined PBX built in Rust — An AI-native communication platform for next-generation contact centers.
Different from Asterisk/FreeSWITCH (C modules), RustPBX exposes all call control via HTTP/WebSocket/Webhook, making it fully programmable in any language. Route decisions, media control, and event streams are all externalized — AI becomes a native participant in every call.
Note: The Voice Agent functionality has been moved to a separate repository: Active Call. This repository now focuses on the SIP Proxy and PBX features.
Software-Defined Communication
RustPBX breaks the closed architecture of traditional PBX systems by exposing three powerful integration channels:
| Channel | Protocol | Purpose |
|---|---|---|
| Policy Decision | HTTP Router | Real-time routing decisions: AI first, agent queue, IVR, or direct transfer |
| Real-time Control | RWI (WebSocket) | In-call control: listen, whisper, barge, transfer, hold, media injection |
| Event Stream | Webhook | Push CDR, queue status, and events to your CRM/ticketing system |
Editions
| Community | Commerce | |
|---|---|---|
| License | MIT | Commercial |
| SIP Proxy + Media | ✅ | ✅ |
| HTTP Router (dynamic routing) | ✅ | ✅ |
| Queue / ACD | ✅ | ✅ |
| Call Recording + SipFlow | ✅ | ✅ |
| Transcript (SenseVoice offline) | ✅ | ✅ |
| Web Console | ✅ | ✅ |
| RWI (WebSocket Interface) | ✅ | ✅ |
| VoIP Wholesale (VOS3000 alternative) | ❌ | ✅ |
| IVR Visual Editor | ❌ | ✅ |
| Voicemail Pro | ❌ | ✅ |
| Enterprise Auth (LDAP/SAML/MFA) | ❌ | ✅ |
| Endpoint Manager (phone auto-provisioning) | ❌ | ✅ |
AI-Native UCaaS Architecture
Architecture Layers:
- App Service Layer: AI Voice Agent, Human Agents, HTTP DialPlan Handler, RWI Call Control, Webhook Consumer, CRM/Ticketing
- RustPBX Core Layer: B2BUA, IVR, Media Fabric, Queue/ACD, Recording, CDR, SIP Trunk
- Access Layer: PSTN (SIP Trunk), WebRTC Browser, SIP Client, Mobile App
Core Capabilities
SIP & Media
- SIP Proxy — Full SIP stack (UDP/TCP/WS/TLS/WebRTC), registration, auth, B2BUA
- Media Proxy — RTP relay, NAT traversal, WebRTC ↔ SIP bridging
- TLS/SRTP — End-to-end encryption with automatic ACME certificate management
Routing & Control
- HTTP Router — Every INVITE hits your webhook; you return routing decision in JSON
- RWI (WebSocket Interface) — Real-time call control: originate, answer, hold, transfer, record, queue management, supervisor whisper/barge, and media stream injection (PCM)
- Queue / ACD — Sequential or parallel agent ringing, hold music, priority scheduling
Recording & Analytics
- SipFlow Recording — Unified SIP+RTP capture; hourly files with on-demand playback (no file-handle exhaustion)
- Transcript — Post-call transcription via local SenseVoice (offline, no cloud dependency)
- CDR Webhooks — Push call detail records + recordings to your system on hangup
Operations
- Web Console — Built-in management UI with visual configuration
- WebRTC Phone — Built-in browser softphone for testing
- RBAC — Role-Based Access Control with fine-grained permissions
- Observability — Built-in Prometheus metrics + OpenTelemetry tracing
Typical Use Cases
| Scenario | Description |
|---|---|
| AI Contact Center | AI Voice Agent handles incoming calls, transfers to human agents for complex issues, 24/7 availability |
| Cloud Call Center | Multi-tenant SaaS architecture, remote agents, WebRTC + SIP endpoints |
| Enterprise UC | Internal communication, conferencing, voicemail, CRM/OA integration |
| VoIP Wholesale | Multi-carrier routing, flexible billing, profit optimization (Commercial) |
| Compliance Recording | Financial/healthcare compliance recording, AI quality inspection, PCI masking |
| Outbound Marketing | Predictive dialing, call analytics, lead scoring |
Quick Start (Docker)
# Commerce image (includes Wholesale + all commercial plugins)
docker pull docker.cnb.cool/miuda.ai/rustpbx:latest
# Community image
docker pull ghcr.io/restsend/rustpbx:latest
Minimal config.toml:
http_addr = "0.0.0.0:8080"
database_url = "sqlite://rustpbx.sqlite3"
[console]
base_path = "/console"
allow_registration = false
[proxy]
addr = "0.0.0.0"
udp_port = 5060
modules = ["auth", "registrar", "call"]
[[proxy.user_backends]]
type = "memory"
users = [{ username = "1001", password = "password" }]
[sipflow]
type = "local"
root = "./config/sipflow"
subdirs = "hourly"
docker run -d --name rustpbx --net host \
-v $(pwd)/config.toml:/app/config.toml \
-v $(pwd)/config:/app/config \
ghcr.io/restsend/rustpbx:latest --conf /app/config.toml
# Create first admin
docker exec rustpbx /app/rustpbx --conf /app/config.toml \
--super-username admin --super-password changeme
Web console: http://localhost:8080/console/
SIP proxy: udp://localhost:5060
Build from Source
Dependencies (Linux):
apt-get install -y cmake pkg-config libasound2-dev libssl-dev libopus-dev
macOS:
brew install cmake openssl pkg-config
git clone https://github.com/restsend/rustpbx
cd rustpbx
cargo build --release
cargo run --bin rustpbx -- --conf config.toml.example
Cross-compilation for aarch64 / x86_64 via cross:
cargo install cross
cross build --release --target aarch64-unknown-linux-gnu
HTTP Router — The Key Extension Point
RustPBX calls your API on every incoming INVITE. You decide what happens:
[proxy.http_router]
url = "https://your-api.com/route"
timeout_ms = 3000
// POST to your endpoint:
{ "call_id": "abc-123", "from": "sip:+861390000@trunk", "to": "sip:400800", "direction": "inbound" }
// Your response:
{ "action": "forward", "targets": ["sip:ai-agent@internal"], "record": true }
Actions: forward · reject · abort · spam
See API Integration Guide for the full webhook and active call control reference.
RWI — Real-time WebSocket Interface
RWI provides JSON-over-WebSocket for real-time call control:
| Category | Commands |
|---|---|
| Call Control | originate, answer, hangup, bridge, transfer, hold, reject |
| Media Control | play, stop, stream_start, inject_start (PCM) |
| Recording | record.start, pause, resume, stop, mask_segment |
| Queue Management | enqueue, dequeue, set_priority, assign_agent, requeue |
| Supervisor | listen, whisper, barge, takeover |
| Conference | create, add, remove, mute, destroy |
See RWI Protocol for details.
Screenshots
| Extensions | Call Records | Route Editor |
|---|---|---|
 |  |  |
| Transcript | SIP Flow | WebRTC Phone |
|---|---|---|
 |  |  |
Documentation
| Configuration Guide | All config options |
| API Integration Guide | HTTP Router, Webhooks, Active Call Control |
| RWI Protocol | WebSocket Interface for real-time call control |
Troubleshooting
SIP 401 behind NAT/Docker — set the realm explicitly:
[proxy]
realms = ["your-public-ip:5060"]
Benchmark
Tested on 2026-04-03 · RustPBX 0.4.0 (release) · sipbot 0.2.28 · Linux x86_64 · 16 cores / 32 GB · G.711 PCMU
Full Comparison
| Level | Scenario | Completion | Peak Conc | Loss | Setup Latency | CPU Peak | Mem Peak |
|---|---|---|---|---|---|---|---|
| 500 | mediaproxy=none | 100% | 500 | 0.00% | 4.40ms | 32.4% | 137.3 MB |
| 500 | mediaproxy=all | 100% | 500 | 0.00% | 3.73ms | 98.4% | 183.1 MB |
| 500 | all + sipflow | 100% | 500 | 0.00% | 5.96ms | 101.0% | 198.3 MB |
| 800 | mediaproxy=none | 100% | 800 | 0.00% | 8.32ms | 47.9% | 191.8 MB |
| 800 | mediaproxy=all | 100% | 800 | 0.00% | 6.38ms | 155.0% | 264.8 MB |
| 800 | all + sipflow | 100% | 800 | 0.00% | 6.08ms | 156.0% | 280.3 MB |
Per-Channel Overhead
| Metric | 500 (none) | 500 (all) | 500 (sipflow) | 800 (none) | 800 (all) | 800 (sipflow) |
|---|---|---|---|---|---|---|
| CPU (Peak) | 0.065% | 0.197% | 0.202% | 0.060% | 0.194% | 0.195% |
| Memory (Peak) | 0.275 MB | 0.366 MB | 0.397 MB | 0.240 MB | 0.331 MB | 0.350 MB |
Resource Scaling Estimate
mediaproxy=none (signaling only):
CPU% ≈ 8 + concurrent × 0.05
Mem(MB) ≈ 60 + concurrent × 0.16
1000 conc: CPU ≈ 58% (0.6 cores), Mem ≈ 220 MB
2000 conc: CPU ≈ 108% (1.1 cores), Mem ≈ 380 MB
5000 conc: CPU ≈ 258% (2.6 cores), Mem ≈ 860 MB
mediaproxy=all (RTP forwarding):
CPU% ≈ 8 + concurrent × 0.19
Mem(MB) ≈ 80 + concurrent × 0.23
1000 conc: CPU ≈ 198% (2.0 cores), Mem ≈ 310 MB
2000 conc: CPU ≈ 388% (3.9 cores), Mem ≈ 540 MB
5000 conc: CPU ≈ 958% (9.6 cores), Mem ≈ 1230 MB
See Benchmark Details for methodology and full results.
License
Community edition: MIT Commercial edition : hi@miuda.ai
https://miuda.ai - Maintenance & commercial support