Short answers, all from ElevenLabs’ official docs:
Does ElevenLabs accept SIP calls from Telnyx FQDNs or require IP authentication?
ElevenLabs accepts inbound SIP calls over TCP/TLS to sip.rtc.elevenlabs.io and supports either digest (username/password) or ACL/IP-based authentication. IP authentication is not required if you use digest auth. The Telnyx guide explicitly uses an FQDN connection and points Telnyx at sip.rtc.elevenlabs.io. (elevenlabs.io)
Is there any IP allowlisting or TLS certificate requirement you may be missing?
Not if you use digest auth. If you choose ACL/IP allowlisting, ElevenLabs’ SIP servers are distributed; a static-IP SIP endpoint is available for Enterprise and requires allowlisting an entire /24 when enabled. TLS is supported (port 5061) and recommended; ensure valid certificates on your provider side. UDP transport is not available. (elevenlabs.io)
Are there logs available on the ElevenLabs side for debugging inbound SIP calls?
Yes. Use the Call History page in Agents; failed calls show a red error explaining why the call didn’t connect. If no error is shown, contact Support. (help.elevenlabs.io)
Quick checks that often resolve “inbound INVITE not reaching ElevenLabs”:
Make sure Telnyx is sending to a full SIP URI with an identifier, e.g. sip:+15551234567@sip.rtc.elevenlabs.io:5060 (or :5061 for TLS). Calling sip@sip.rtc.elevenlabs.io without an identifier will not route. The imported phone number must match the exact formatting (+ or no +) used in the INVITE. (elevenlabs.io)
Transport must be TCP or TLS; UDP is not supported. If using TLS, verify port 5061 and certificate validity. (elevenlabs.io)
For outbound-from-ElevenLabs (which you said works), the “Address” should be your Telnyx hostname (FQDN) only—no sip: prefix. (elevenlabs.io)
If you still don’t see inbound attempts in Call History after the above, confirm on the Telnyx side that the SIP connection’s destination/origination is set to sip.rtc.elevenlabs.io and that the number format is +E.164 as per the Telnyx setup guide. (elevenlabs.io)
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