sipgate SIP Bridge

Minimal Asterisk container that connects sipgate trunking to any AI voice platform.

What does it do? Registers with sipgate, accepts incoming calls, and forwards them via SIP to the AI platform of your choice.

Quick Start

# 1. Clone / unpack
cd sip-bridge

# 2. Create .env
cp .env.example .env

# 3. Edit .env — fill in your values:
#    EXTERNAL_IP, SIPGATE_USER, SIPGATE_PASS, AI_SIP_HOST

# 4. Start
docker compose up -d

# 5. Check logs & status
docker logs -f sip-bridge

Configuration (.env)

Variable	Description	Example
EXTERNAL_IP	Public IP of your server	1.2.3.4
SIPGATE_USER	sipgate trunk account	1234567t0
SIPGATE_PASS	sipgate password	secret123
AI_SIP_HOST	SIP host of the AI platform	sip.rtc.elevenlabs.io
AI_SIP_PORT	SIP port (usually 5060)	5060
AI_SIP_TRANSPORT	Transport protocol	tcp

Requirements

• VPS or server with a public IP address and Docker installed (e.g. Hetzner CX22, ~€4/month)
• Set EXTERNAL_IP to your server's public IP — Asterisk uses it to announce the correct RTP address behind Docker NAT

Firewall

ufw allow from 217.10.68.0/24 to any port 5060    # sipgate signaling
ufw allow from 217.116.112.0/20 to any port 5060  # sipgate signaling
ufw allow 5060/tcp                                 # AI platform
ufw allow 10000:10100/udp                          # RTP media

Debugging

docker exec sip-bridge asterisk -rx "pjsip show registrations"  # sipgate registration
docker exec sip-bridge asterisk -rx "pjsip show endpoints"      # endpoints
docker exec sip-bridge asterisk -rx "core show channels"         # active calls

# Interactive CLI
docker exec -it sip-bridge asterisk -rvvv

AI Platform Setup

Most AI voice platforms have an "Import number from SIP trunk" option. Enter your VPS's public IP as the address.

Authentication

By default no SIP credentials are configured — the AI platform should use IP-based ACL authentication with "Allow all addresses". If your platform requires digest auth, set AI_SIP_USER and AI_SIP_PASS in .env.

Supported Platforms

Platform	SIP Host	Port	Transport
ElevenLabs	sip.rtc.elevenlabs.io	5060	tcp
Vapi	sip.vapi.ai	5060	tcp
Retell	sip.retellai.com	5060	tcp
Bland AI	sip.bland.ai	5060	tcp

Resources

~30–50 MB RAM, <1% CPU idle, ~100 MB disk.