VAPI does not register to SIP, no calls received
# supportn
nietsnie
07/23/2025, 3:37 PMI am having trouble getting VAPI to register to an external SIP (I have tried freeswitch from AWS and it connects correctly, I get the call).
When I set it up in VAPI a voice tells me that it is not possible to communicate with the phone. I suspect that VAPI has not registered correctly to the SIP. how can I get a log of these failures? I have checked api logs but nothing.
Any idea what could be going wrong?
https://cdn.discordapp.com/attachments/1397603497712554014/1397603498333438042/Captura_de_pantalla_2025-07-23_a_las_5.34.11_p._m..png?ex=68825330&is=688101b0&hm=f9009279e7eb1e2c464982184c314042578b4451dec4e7cadbdaa685e4a33622&
https://cdn.discordapp.com/attachments/1397603497712554014/1397603498660724896/Captura_de_pantalla_2025-07-23_a_las_5.34.52_p._m..png?ex=68825330&is=688101b0&hm=4e9289e5e13f9bdf924ac0006fb9d7f84e9e0a979534278130069f8ac1abd8a2&
nietsnie
07/23/2025, 4:24 PMThats a spanish number, Could that be a problem?
nietsnie
07/23/2025, 4:25 PMi got this message running a test. but theoretically, I should receive the call if I am registering the SIP.
https://cdn.discordapp.com/attachments/1397603497712554014/1397615541061025983/Captura_de_pantalla_2025-07-23_a_las_6.24.40_p._m..png?ex=68825e67&is=68810ce7&hm=b022ae7dd2f24636558ab72a4339376837ffd32ca849a735d09974d918966d7a&
c
Chiranjeet Mishra
07/23/2025, 6:45 PMHey, can you share the org_id? You can find it [here](https://dashboard.vapi.ai/org/settings). This will help me get more details about it.
n
nietsnie
07/23/2025, 6:56 PMyes d73d8d88-05d0-4f05-a348-537ef1bba67e
nietsnie
07/24/2025, 8:05 AMHi Praveen, thank you very much for your help, finally you could see what was happening?
Thanks again!
nietsnie
07/25/2025, 8:07 AMHi Praveen, sorry to insist again, could you see something about my problem? thank you very much as always
Greetings!
c
Chiranjeet Mishra
07/31/2025, 12:54 AMHi Ignacio,
To troubleshoot why Vapi is not registering with your external SIP, please follow these steps:
1. **Verify IP Whitelisting**: Ensure that the following Vapi SIP server static IPs are whitelisted in your SIP provider's configuration:
- 44.229.228.186
- 44.238.177.138
- 172.31.9.106
2. **Check SIP Provider Settings**: Confirm that all SIP provider details, including server address and authentication credentials, are correctly entered in Vapi.
3. **Network Configuration**: Ensure that your network allows SIP signaling and media between Vapi and your SIP provider without interference.
4. **Logs**: Since you are having difficulty accessing logs, make sure that your SIP provider's logs are also checked to see if there is any blocking on their end.
5. **Codec Support**: Ensure that your trunk only supports G.711 µ-law and A-law codecs, as other codecs may not be supported by Plivo SIP trunks.
6. **Testing Configuration**: Re-test your setup by:
- Making a test call using the API to initiate outbound calls.
- Verifying that inbound calls are configured to reach your SIP URI correctly.
If these steps do not resolve the issue, please try checking with your SIP provider for any additional requirements or potential restrictions affecting the registration. You can also refer to the [Plivo SIP Integration guide](https://docs.vapi.ai/advanced/sip/plivo) for detailed setup instructions.