Skip to main content
Create a Telnyx FQDN connection whose primary destination is the platform SIP FQDN. Assign the DID, and configure Telnyx ANI and DNIS number formats as +E.164. On the platform, use the exact +E.164 DID and Provider source IPs. Telnyx credentials or IP authentication for calls into Telnyx are outbound settings; they do not document digest authentication from Telnyx to an arbitrary FQDN destination. Allow both signaling addresses for the connection’s selected inbound region: Use TCP 5060 for standard signaling; Telnyx also supports TLS 5061. Re-open the Telnyx live network page before saving because regional addresses can change.

​
Troubleshooting

Outbound calls fail with a 403 and “Dialed number is not included in whitelisted countries” — the connection’s Outbound Voice Profile restricts destinations by default. Open that profile’s Allowed Destinations and add the countries you need. A connection with the right FQDN and IP allowlist still won’t complete outbound calls to a country that isn’t explicitly enabled there.

​
Validate

Place one external inbound call and verify the call record, assigned assistant, and two-way audio. If it fails, check the connection’s inbound region and the DID format before widening any address range. Sources: Telnyx authentication directions, Telnyx live SIP network data. Accessed 22 August 2026.