A customer calls my Google Voice number which is configured to forward the call to my Twilio Vapi number. However, the customer only hears the Google Voice ringing and voicemail, and never gets connected to the Vapi agent. I can see in the Vapi call logs that a call did come through to Vapi--the agent gave its opening line but did not pick up any of the customer's audio. Call ID: 882284e5-d459-4793-8b1e-4b032df715f0 I already successfully linked my phone number in Google Voice, and tested call forwarding with non-Vapi numbers which worked.

Hi there! 👋 I understand you're having issues with your Google Voice number forwarding to your Twilio Vapi number. I can't access your specific call logs for the ID you provided, but I can definitely help troubleshoot the general issue where customers only hear Google Voice ringing and voicemail while your Vapi agent gives its opening line but doesn't pick up customer audio. Based on the information I found, here are some potential causes and troubleshooting steps: ### Twilio Webhook Configuration One of the most common issues is incorrect webhook configuration. Make sure your Twilio webhook is pointing to Vapi's endpoint rather than SIP or another destination. According to [Discord discussions](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1343208312249913397), a user resolved a similar issue by switching the Twilio setting from SIP to Webhook. ### Audio Transmission Issues The fact that your agent gives its opening line but doesn't pick up customer audio suggests a one-way audio problem. This could be related to: - Network connectivity issues disrupting audio transmission - Voicemail detection problems interrupting the call flow - Audio encoding/decoding errors between Google Voice and Twilio ### Check Vapi Configuration Verify that VAPI is correctly set up to handle incoming calls from Twilio. According to [Discord discussions](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1332470088078590023), ensure that: - Your Twilio number has the VAPI inbound URL configured - You have associated an assistant with your phone number ### PSTN to SIP Forwarding Limitation There might be a limitation with PSTN to SIP forwarding. According to [Discord discussions](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1342493405900439593), "VAPI does not support PSTN to SIP forwarding." Since Google Voice is PSTN and Twilio Vapi is SIP, this could be relevant to your issue.

@Sahil will be with you shortly when available thanks

Can you send me the google voice number? I can make a call and test it out.

Just DMd you, thanks

Marking this ticket as Solved ✅ x

Can you share me your phone number id as well where you are forwarding the call to?