Solution:
1. Check whether the registered account and password are correct.
2. Check the format of the To header field on the SIP AT0 trunk. During registration, number regulation is enabled for SIP registration messages by default. The format of the To header field is Invite "3001;phone-context=+86755@huawei". The IMS may not support this format.
Run the number-parameter 27 0 command in the SIP AT0 trunk view to set parameter 27 to 0. If parameter 27 is set to 0, number regulation is disabled.
[Huawei-voice-trunkgroup-sipat0] number-parameter 27 0
The local device uses SIP to connect to the peer device through the SIP AT0 trunk over the IP network.
PBX users can use SIP AT0 trunks to perform SIP calls or other applications through the IMS or softswitch. One SIP AT0 trunk can be used by only one user at a time. Incoming calls over the SIP AT0 trunk are forwarded to the local device or switchboard by default.
The SIP server needs to open ports.
Take the SC server as an example.
Source IP address Source port number Open SC port number Protocol Port description
SIP UA IP address 1024-65535 5060 UDP SIP TCP/UDP Port for listening signaling from the SIP node
SIP UA IP address 1024-65535 5061 TCP SIP TLS Port for listening for signaling from the SIP node
SIP UA IP address 1024-65535 5070-6071 UDP SIP BFCP port Port opened when the shared presentation is required
IP address on the SC public network 10010-11010 (Note: An openness source is required) TCP for SIP and TCP/TLS Port for calling unregistered extranet devices
IP address of the H.323/SIP device 1024-65535 20010-32010 UDP RTP Port for receiving voice and video code streams from the H.323 node and SIP UA
You can delete a SIP trunk on the U1900 using the CLI or web management system.
1. Run the config protocol sip disable command in the config mode.
2. Log in to the web management system of the U1900. Choose Trunk > Trunk Configuration > SIP, select a SIP trunk, and click Delete.
