VoNR Call Flow for UPF
This section describes the steps for VoNR session and respective PDR Creation on UPF.VoNR Call Flow 

Step | Description |
---|---|
1 |
UE1 and UE2 are registered on 5G network. They establish the IMS PDU session and both are registered with same IMS. Both UEs are in connected mode. |
2 |
For IMS signaling, a non-GBR QoS PDRs (UL and DL) is created by SMF which has the QFI value that corresponds to 5QI value 5. |
3 |
Similarly, for Conversational Voice traffic, the PDRs for GBR QoS flow is created with the QFI value that corresponds to 5QI value 1. |
4 |
The QFI to 5QI mapping is maintained by SMF, hence the QFI does not have the values same as 5QI. |
5 |
The above steps are valid for both Mobile Originated (MO) or Mobile Terminate (MT) call flows. |
6 |
Refer to 3GPP TS 23.501, Section 5.7.4 for other types of 5QI mappings for GBR or Non-GBR flows. |