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Error with the outbound function
# support
t
id call: ba6848e2-231a-4532-b82f-82a2099255f6 the error is: An error occurred in this call: call.in-progress.error-sip-telephony-provider-failed-to-connect-call
v
Hi there! 👋 I see you're encountering an error with the outbound function. I'm unable to determine the exact cause for your specific call ID, but I can definitely help explain what this error means and provide troubleshooting steps to resolve it. ## What this error means The error 
call.in-progress.error-sip-telephony-provider-failed-to-connect-call
indicates that there was a failure to connect a call via the SIP telephony provider. According to the information I found, this typically happens when the telephony provider fails to respond or connect within the required time, or when there are issues with the SIP configuration. ## Potential causes There are several possible reasons for this error: 1. **SIP configuration issues**: Your SIP configuration might have incorrect settings or formatting issues with the SIP URI. 2. **Network connectivity problems**: Your network might be blocking SIP traffic, or there could be firewall/NAT configuration issues preventing SIP messages from passing through. 3. **Telephony provider issues**: There might be technical glitches or maintenance activities on your telephony provider's side. 4. **Authentication problems**: Missing or incorrect SIP authentication credentials could be causing the call to fail. 5. **SIP server configuration**: Your SIP server might not be configured to accept calls from Vapi's servers. ## Troubleshooting steps Here are some steps you can take to resolve this issue: 1. **Check SIP URI**: Ensure that the SIP URI in the 
sipUri
attribute within the 
forwardingPhoneNumbers
array is correctly formatted and points to a valid SIP address. 2. **Verify network configuration**: Make sure your network allows traffic on the SIP protocol and that any firewalls or NATs are configured to allow SIP messages to pass through. 3. **Review SIP server configuration**: Confirm that your SIP server or PBX is configured to accept calls from Vapi's servers and that it's not rejecting incoming INVITE requests.
4. **Check credentials and authentication**: If your SIP endpoint requires authentication, double-check that the credentials provided to Vapi are correct. 5. **Verify codecs compatibility**: Ensure that the codecs used by Vapi are supported by your SIP endpoint. 6. **Review logs**: Check your telephony logs to see what went wrong during the connection attempt. 7. **Check SIP REFER handling**: Confirm that your system is set up to handle SIP REFER messages, as Vapi uses SIP REFER to transfer calls. 8. **Verify forwarding number format**: If you're using a forwarding phone number, ensure it's in the correct E.164 format (e.g., +15558675309). Is there anything specific about your setup that you'd like me to help troubleshoot further? Sources: - [What does the error 'call.in-progress.error-sip-telephony-provider-failed-to-connect-call' mean in Vapi?](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1336713212233515089) - [call.in-progress.error-sip-telephony-provider-failed-to-connect-call error causes](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1340144301132353637) - [call.in-progress.error-sip-telephony-provider-failed-to-connect-call troubleshooting steps](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1336713212233515089) - [SIP telephony provider connection issues](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1334651376743092355)
k
To help track down this issue, could you share one or two: \- When exactly this happened (the timestamp) \- What response you expected to get \- What response you actually got instead This would really help us figure out what went wrong!
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