- Firmware version: Any
- Model: S-Series
The SIP trunk is registered, but PBX can't receive the incoming call. When receiving the incoming call, the S-Series PBX reply '401 Unauthorized'.
The PCAP log shows the S20 reply '401 Unauthorized'.
The CLI log shows 'didn not match the Provider's IP address'.
Change the port from 0 to 5060 on trunk page.