Feature Description
The SMF supports Mobile Originated (MO) and Mobile Terminated (MT) VoNR with 5G QoS Identifier (5QI) as Guaranteed Bit Rate (GBR) flow for UE after the IMS PDU Session Creation. The SMF further supports VoNR calls for the following mobility (inter gNB, inter AMF) scenarios:
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MO and MT calls for idle mode UE
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MO and MT calls when the UE is handing over
During the mobility scenario of VoNR MO and MT calls, make sure to consider the following points:
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VoNR GBR flows are supported during UE and network service request procedures, Xn and N2 based handover.
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QoS failures at N1 and N2 interface, which are rejected by UE and gNB, are not handled by SMF.
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Charging features are not integrated with VoNR MO and MT, and mobility features.