Hi, my SIP trunk stopped working. I didnt change anything. I can register it with the regular softphone without any issues but it doesnt work in Vapi. Do you experience problems with your trunking? I can provide call log when it was successful and also when it wasnt. In addition my operators gateway monitor shows the number is not registered. Are there any sip logs available to check the reason?

Hi, could you please provide a call id where you experienced this issue? We would like to review the logs to identify the cause.

Call ID from the test call: Successful outbound call from the SIP account: ef6d6973-143d-431f-a456-c2c5b44666a8 13 Aug 2025, 15:21 Successful inbound call for same SIP account in the past: 122d7b46-1479-48c1-b008-ecd52db866bb at 1 Aug 2025, 14:44 Detailed description of what happened: our SIP trunk stopped working. I didn't change anything. I can register it with the regular softphone without any issues but it doesn't work in Vapi. Do you experience problems with your trunking? I provided call logs when it was successful in the past. I dont have unsuccessful logs for inbound as they are not created. In addition my operators gateway monitor shows the phone number is not registered. Are there any sip logs available to check the reason? I can make outbound call and the SIP account registers once and places the successful outbound call. But it doesn't repeat the registration after the time is expired. We have experimented with the phone number canonical form, having +48xxxx and 48xxx and none work Expected behavior vs. actual behavior: please make it possible to receive calls via BYOL SIP account. It worked before.

Hi, sorry for the delayed response. The team is working on it and they'll get back to you shortly

ok, thank you

Please make sure your inbound gateway for the SIP trunk is separate from the outbound gateway and has the direct IP address of the domain instead of the resolved name. Here is an example of how your SIP trunk should look:

{
  "provider": "byo-sip-trunk",
  "name": "My SIP Trunk",
  "gateways": [
    {
      "ip": "sip.provider.com",
      "port": 5060,
      "outboundEnabled": true,
      "inboundEnabled": false,
      "outboundProtocol": "udp"
    },
    {
      "ip": "203.0.113.10",
      "port": 5060,
      "outboundEnabled": false,
      "inboundEnabled": true
    }
  ]
}

Please reconfigure your SIP trunk to have these attributes if you don't already and perform some tests with it. Let us know if you encounter any issues

hi, I will try to limit it just to inbound only and let you know the result

Hi, you can refer to this Let me know if you face any issues.

I dont use Plivo, I use the SIP accunt provisioned by our local partner, should I use Plivo?

Pivilo was just for reference. If you wish I can send you the entire Twilio SIP docs.

No, my Twilio SIP is working fine. I have only the problem with BYOL SIP, can you help with it?