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.

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