If the user is using VoLTE call in LTE network and came to the LTE network edge, what will happen in this situation?
September 4, 2018

There are two solutions:

1. The VoLTE call will make handover to CS domain of UTRAN or GERAN if VoIP service is not supported in target networks. This handover type is called SRVCC, with longer name Single Radio Voice Call Continuity.

2. The VoLTE call will make handover to PS domain of UTRAN or GERAN if VoIP service is supported in target networks.

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