HI! I'm trying to input a Twilio number and I followed all the steps for the video in the docs. However, the outbound calls all fail with this error message

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

The inbound calls work which is even more confusing. The call id of the outbound call that failed is

02012940-1c16-416e-9f61-9d8a47f248db

Check your Twilio webhook configuration for the phone number. Ensure it's set to "Webhook" (not "SIP") and points to the Vapi endpoint. Here's how to verify: 1. Go to your Twilio console > Phone Numbers > Manage > Active Numbers 2. Select your number and check the "Voice & Fax" section 3. Ensure the webhook URL is set to:

https://api.vapi.ai/twilio/inbound_call

This is a common issue where inbound calls fail due to incorrect webhook settings. Sources: - [Discord discussion about webhook settings](https://discord.com/channels/1211482211119796234/1343208312249913397) - [Discord troubleshooting thread](https://discord.com/channels/1211482211119796234/1333867863462903868)

@Vapi Support Bot the inbound works but the outbound fails

Check your Twilio account permissions for outbound calls. This error often occurs due to: 1. **Geographic Permissions**: Go to Twilio Console > Voice > Geo Permissions and ensure the countries you're calling are enabled 2. **Account Balance**: Verify your Twilio account has sufficient funds 3. **Number Verification**: For free Twilio accounts, ensure the destination number is verified If the issue persists, check Twilio logs for error code "32017" which indicates carrier blocking. Sources: - [Discord troubleshooting thread](https://discord.com/channels/1211482211119796234/1336432457943351358) - [Discord carrier blocking discussion](https://discord.com/channels/1211482211119796234/1341213363744800769)

Message marked as helpful by @Vraj! 🎉

Hey Vraj, can you share more call IDs similar to this?

Hi @Vraj ,

a gentle reminder to continue this thread.