SRVCC in Mobile Network

SRVCC refers to "Single Radio Voice Call Continuity". It is a mechanism that allows seamless handover of voice calls, from the 4G/LTE network to the 2G/3G circuit-switched network.

SRVCC is used when the UE moves from 4G/LTE network coverage to 2G/3G network coverage, while the UE is having an ongoing voice call.

This ensures service continuity, and prevents the voice call from being dropped during the handover process.