Troubleshooting
Common SIP problems and how to fix them.
SIP responses
| Code | Meaning | Check |
|---|---|---|
401 / 407 | Authentication failed | Trunk username and password. |
403 | Not allowed | The trunk is enabled and your wallet has credit. |
429 | Caller ID refused | Use one of your Vonyx numbers as caller ID. |
404 | Number not found | The dialled number's format. |
480 / 486 | Callee unavailable or busy | Nothing on your side. Try later. |
503 | Service unavailable | You may be at your channel limit. |
Call connects but there's no audio
- Allow RTP on UDP
10000–20000in your firewall. - Offer PCMU or PCMA. Other codecs are not supported.
- If your server is behind NAT, advertise its public IP in SDP.
Inbound calls don't arrive
- Inbound calls is on for the trunk, and the number is attached to it.
- The inbound address is a reachable host, without
sip:. - Your server accepts SIP from
43.204.9.41.