What is the SIP-AT0 trunk of AR router

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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.

Other related questions:
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 trunk of the AR router
A trunk is a logical link between two exchange offices. Inter-office calls must be transmitted by trunks. The AR router supports the following trunks: - A PRA trunk is connected to a VE1 interface and is usually used to connect two PBXs. - AT0 trunk: An AT0 trunk is connected to an FXO interface. It is an analog circuit trunk and uses the FXO interface of the AR to connect to the PSTN through a common telephone line. If PBX users in an enterprise need to make local calls to external users or to make toll calls, the AT0 trunk is configured. - SIP trunk: SIP trunk includes SIP AT0, SIP PRA and SIP IP trunks. A SIP trunk is established on an IP link and connects a PBX and an IMS. - E1R2 trunk: An E1R2 trunk is connected to a VE1 interface. The E1R2 trunk is usually used to connect two PBXs. If the remote device uses R2 signaling, use the E1R2 trunk to connect to the AR to the remote device. (Note: V200R002C00 and later versions support the E1R2 trunk.) - H323 trunk: An H323 trunk is established on an IP link and connects a PBX and an IMS or PBXs in different areas. (Note: V200R002C01 and later versions support the H323 trunk.) - BRA trunk: A BRA trunk is connected to a BRA interface. It can be used to connect a PBX to the ISDN. (Note: V200R002C02 and later versions support the BRA trunk.)

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

A SIP AT0 trunk fails to be registered with the IMS
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.

How to configure an AT0 trunk on U1900
For details, see Configuration > Configuring Trunks > Configuring Signaling Data > Configuring an AT0 Trunk in the product documentation .

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