I am unable to get any of the agents on the calls using the vapi phone numbers. The agents work fine on numbers I got from twilio.

Hi there! Sorry to hear you're having trouble with your Vapi phone numbers. This is a common issue that could be caused by several factors. Let me help you troubleshoot 🔍 Common reasons for Vapi phone number connection issues: 1. **SIP Configuration Issues**: - Check if your SIP URI is correctly formatted in the

forwardingPhoneNumbers

array - Ensure your SIP server accepts connections from Vapi servers - Verify your system handles SIP REFER messages correctly (required for call transfers) 2. **Network Configuration**: - Confirm your network allows SIP traffic - Check that firewalls or NAT configurations aren't blocking SIP messages 3. **Configuration Errors**: - Verify your assistant is properly configured to answer calls - Double-check API keys and access permissions 4. **Specific Vapi vs Twilio Differences**: - Vapi has different timeout settings like

silenceTimeoutSeconds

that affect call handling - Voicemail detection configuration differs from Twilio's defaults - Endpointing behavior relies on audio-text models that may need adjustment Troubleshooting steps: 1. Check your SIP server logs for any errors related to incoming INVITE requests 2. Review call logs for errors or unusual disconnects 3. Conduct test calls and analyze both successful and failed attempts 4. Verify credentials and authentication for your SIP endpoint If you could share more details about your specific setup, I might be able to provide more targeted assistance! Sources: - [Discord Link](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1336713212233515089) - [Discord Link](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1340144301132353637) - [Discord Link](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1341449578100031488) - [Call Volume](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1332286268805087272)

It just doesn't ring

Hey can you share the phone number ID?

Somehow they got fixed yesterday by itself. Was down for a day.