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sahilsuman933 merged 1 commit into from
Jan 21, 2026
Merged

Telnyx docs gateway IPs #887

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17 changes: 13 additions & 4 deletions fern/advanced/sip/sip-telnyx.mdx
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Original file line number Diff line number Diff line change
Expand Up @@ -85,6 +85,9 @@ Integrate your Telnyx SIP trunk with Vapi to enable your AI voice assistants to

<Step title="Add your Telnyx SIP credentials to Vapi">
Use the Vapi API to create a SIP trunk credential:
<Warning>
Use IP addresses in `gateways`. FQDNs like `sip.telnyx.com` return a `400 Bad Request`.
</Warning>
```bash
curl -X POST https://api.vapi.ai/credential \
-H "Content-Type: application/json" \
Expand All @@ -94,20 +97,26 @@ Integrate your Telnyx SIP trunk with Vapi to enable your AI voice assistants to
"name": "Telnyx Trunk",
"gateways": [
{
"ip": "sip.telnyx.com",
"inboundEnabled": false
"ip": "192.76.120.10",
"inboundEnabled": true
},
{
"ip": "64.16.250.10",
"inboundEnabled": true
}
],
"outboundAuthenticationPlan": {
"authUsername": "YOUR_SIP_USERNAME",
"authPassword": "YOUR_SIP_PASSWORD",
"sipRegisterPlan": {
"realm": "sip.telnyx.com"
}
"realm": "sip.telnyx.com"
}
}
}'
```
Replace `YOUR_VAPI_PRIVATE_KEY`, `YOUR_SIP_USERNAME`, and `YOUR_SIP_PASSWORD` with your actual credentials.
Replace the gateway IPs with the Telnyx gateway IPs assigned to your trunk.
Set `inboundEnabled` to `false` if you only need outbound calls.
If successful, the response will include an `id` for the created credential, which you'll use in the next step.
</Step>

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