6.2.1A Service Request procedures for (v)SRVCC

23.2163GPPRelease 16Single Radio Voice Call Continuity (SRVCC)Stage 2TS

Service Request procedures for 3GPP (v)SRVCC UE are performed as defined in TS 23.401 [2] with the following additions:

– MME includes a "SRVCC operation possible" indication in the S1 AP Initial Context Setup Request, meaning that both UE and MME are SRVCC-capable and that STN-SR and C-MSISDN are included in the subscription data.