I'm trying to make calls and figure out what the problem is with the transfer because it's not working. However, the PCAP file doesn’t appear, so I can’t see the call trace.

That usually happens when call recording or PCAP logging isn’t enabled in your SIP or Vapi configuration, so no trace file is generated. I can help you set it up are you using a custom SIP trunk or the default Vapi setup for your calls?

I am using a custom SIP trunk, but I can´t see any option to enable the pcap file.

Ah, got it! Since you’re on a custom SIP trunk, we’ll need to tweak a few settings to enable PCAP logging properly. I can guide you step-by-step or even set it up for you so you can see the call traces without issues.

Hi GeraDeluxer, To generate a PCAP file for call debugging, you can follow these steps from the Vapi documentation: 1. Use the provided API endpoint to retrieve the call details.

bash
   curl -X GET "https://api.vapi.ai/call/{call_id}" \
   -H "Authorization: Bearer YOUR_API_KEY"

2. The response will include a

pcapUrl

field. Download the PCAP file using this URL and open it in Wireshark for detailed analysis. 3. In Wireshark, you can filter for SIP transfer packets using:

sip.Method == "REFER"

For further guidance, you can refer to the [Vapi documentation on troubleshooting call forwarding drops](https://docs.vapi.ai/phone-calling/transfer-calls/debug-forwarding-drops).