Telnyx SIP trunk is sending inbound INVITEs to sip:c845c44d8a3047cb80c7a2959c4f01a7@sip.vapi.ai, while the Vapi phone number ID shown in dashboard is c845c44d-8a30-47cb-80c7-a2959c4f01a7. Telnyx UI for Translated Number does not preserve hyphens. Vapi returns 200 OK and then sends BYE after ACK. Can you confirm whether the non-hyphenated form is supported, or provide the exact SIP URI/format Telnyx should target for this phone number?

Vapi expects the SIP URI to match the phone number ID (with hyphens) as shown in your dashboard. Set the "Translated Number" in Telnyx to:

sip:c845c44d-8a30-47cb-80c7-a2959c4f01a7@sip.vapi.ai

The non-hyphenated form is not documented as supported. Ensure the SIP URI includes hyphens to avoid routing issues. For reference, see the official [Vapi Telnyx SIP integration guide](https://docs.vapi.ai/advanced/sip/telnyx). Source: - [Vapi Telnyx SIP integration guide](https://docs.vapi.ai/advanced/sip/telnyx)