A SIP AT0 trunk fails to be registered with the IMS

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Check whether the registered account and password are correct.

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.

Other related questions:
The SIP AT0 trunk fails to be registered with the IMS
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

What is the SIP AT0 trunk
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.

What is the SIP-AT0 trunk of AR router
The SIP AT0 trunk connects the local device to the remote device through the SIP over the IP network When a PBX user wants to complete SIP calls or other applications through the IMS or softswitch, the SIP AT0 trunk can be used. A user can use one SIP AT0 trunk at one time only, and incoming calls are transferred to the local called number or switchboard number.

SIP users fail to be registered after outbound NAT is configured and canceled on the public network interface of the AR
Q: SIP users fail to be registered after outbound NAT is configured and canceled on the public network interface of the AR. A: SIP users connect to the SIP server through the AR enabled with outbound NAT. The ALG function is disabled for SIP, so STP packets cannot traverse the NAT device. As a result, the SIP server cannot communicate with SIP users and SIP users fail to be registered. When registration request packets of SIP users pass through the AR, the AR generates NAT session entries to record packet information and updates entries and the aging time after new packets are received. After the aging time is reached, the NAT session entries that fail to be updated are automatically cleared. Therefore, the SIP users that fail to be registered continue to send registration request packets. NAT session entries cannot be directly cleared after outbound NAT is canceled, and are automatically cleared after the aging time is reached. Because SIP users continuously send registration request packets, the AR continuously update NAT session entries and theaging time. That is, the NAT session entries cannot be automatically cleared. As a result, the SIP users fail to be registered. Run the nat alg command to enable ALG for SIP so that the SIP server can communicate with SIP users after outbound NAT is configured. In addition, run the reset nat session all command to forcibly clear the NAT session entries and quickly change the NAT configuration. Or, you can run the reset nat session all command to forcibly clear NAT session entries after outbound NAT is canceled, so that the SIP server can communicate with SIP users. Note: Deleting NAT mapping entries may affect exchange of some packets.

How can I configure SIP on TE10?
You can use either of the following methods to configure SIP on TE10: On the remote control UI: Choose System Settings > SIP and set SIP server parameters. On the web page: Choose System Settings > Network > SIP and set SIP parameters.

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