Overview
Connect Vonyx to your voice-AI platform, framework or PBX.
Every integration needs a Vonyx account with credit, a number and a SIP trunk. Then follow your platform's guide.
Voice-AI platforms
Vapi
Bring-your-own SIP trunk, dashboard or API.
Retell AI
Custom telephony with SIP trunking.
ElevenLabs
Direct WebSocket, or SIP trunk import.
Ultravox
Outgoing and incoming SIP calls.
OpenAI Realtime
Through a LiveKit bridge.
Frameworks
PBX and SIP servers
Asterisk
PJSIP trunk and dialplan.
FreeSWITCH
Gateway on the external profile.
3CX
Generic SIP trunk.
Kamailio
Vonyx as an upstream gateway.
What works where
| Platform | Connects by | Outbound | Inbound |
|---|---|---|---|
| Vapi | SIP trunk | Yes | Yes |
| Retell AI | SIP trunk | Yes | Yes |
| ElevenLabs | Call API WebSocket, or SIP trunk | Yes | SIP trunk only |
| Ultravox | SIP | Yes | Yes |
| OpenAI Realtime | LiveKit bridge | Yes | Yes |
| LiveKit | SIP trunk | Yes | Yes |
| Pipecat | LiveKit SIP | Yes | Yes |
| Asterisk, FreeSWITCH, 3CX, Kamailio | SIP trunk | Yes | Yes |
Not available yet
DTMF (keypad tones) and call transfer don't work on Vonyx yet, on any platform. Each guide notes which of the platform's features this affects.