generous-coffeeG
VAPI•8mo ago
generous-coffee

Issue with Outbound Calls through Telnyx SIP and VAPI

Hey everyone! 👋

I'm trying to set up outbound calling through VAPI using Telnyx as the SIP provider. I keep getting this persistent error:

An error occurred in this call: call.in-progress.error-sip-telephony-provider-failed-to-connect-call


Inbound calls were working fine, but after attempting to configure outbound calling, I've been running into issues.

What I've already checked:
  • Created proper SIP credentials in VAPI according to the documentation
  • Configured SIP Trunk in Telnyx (both inbound FQDN and outbound credentials)
  • Created an Outbound Voice Profile in Telnyx and assigned it to the SIP trunk
  • Tried initiating calls through VAPI API using the correct format with /call/phone
Configuration details:
  • API endpoint works correctly (status "queued")
  • Using customer.number format for the destination number
  • The issue likely occurs at the communication level between VAPI and Telnyx
Has anyone experienced a similar issue or have any ideas about what might be causing this? Any help would be greatly appreciated!

Thanks in advance! 🙏​​​​​​​​​​​​​​​​
Was this page helpful?