Is only the value-added service package for voice service required when the AR router is connected to an IP phone through an AT0 trunk

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The AR must work in PBX mode when the AR connects to an IP phone and the PSTN through the AT0 interface. After the value-added service package for voice services is configured, you need to request the license. In V200R003 and earlier versions, the CM license needs to be configured. In V200R005 and later versions, UC Express License Package and UC Express IP Quantity need to be configured.

Other related questions:
Is only the value-added service package for voice service required when the AR router is connected to an IP phone through an AT0 trunk
The AR must work in PBX mode when the AR connects to an IP phone and the PSTN through the AT0 interface. After the value-added service package for voice services is configured, you need to request the license. In V200R003 and earlier versions, the CM license needs to be configured. In V200R005 and later versions, UC Express License Package and UC Express IP Quantity need to be configured.

The AR connects to IP phones and AT0 trunk is used. Do value-added service packages for voice services need to be configured
The AR must work in PBX mode when the AR connects to the PSTN through the AT0 interface. After the value-added service package for voice services is configured, you need to configure CM&BEST License.

Voice and video services are no smooth when MP services are deployed on the AR router
When MP services are deployed, QoS LLQ queues are often used in the uplink and special flows enter LLQ queues. Low delay and packet loss ratio are ensured for LLQ queues that voice services enter. To ensure that voice and video services are rapidly and smoothly transmitted, enable LFI on the MP-group interface. Run the ppp mp lfi command in the MP-group interface view.

When the IP phone under the U1911 initiates an outgoing conference call through the AT0 trunk, which AT0 trunk is used to route the call?
In the scenario where the U1900 uses the AT0 trunk for networking, for a local conference initiated on the IP phone, the corresponding dedicated line is used; for an instant conference, the line is selected in polling mode. If all AT0 lines are dedicated lines, only the outgoing call for initiating a local conference can be routed through these lines.

Is the CT license required when the IP phone connects to the AR
The CT license is used to implement call transfer over a trunk. That is, calls received over one trunk are forwarded over another trunk. The CT license is not required when the IP phone connects to the AR.

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