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5GS-R1. General Registration
17 of 27 
Signalling flow for TS 23.502 General Register - PCF selection

Step 15, verbatim
If the AMF decides to initiate PCF communication, the AMF acts as follows.
If the new AMF decided to contact the (V-)PCF idenfied by PCF ID included in UE context from the old AMF in step 5, the AMF contacts the (V-)PCF identified by the (V-)PCF ID. If the AMF decides to perform PCF discovery and selection and the AMF selects a (V)-PCF and may select an H-PCF (for roaming scenario) as described in TS 23.501 [2], clause and according to the V-NRF to H-NRF interaction described in clause