Single Radio Voice Call Continuity addresses a critical scenario where a subscriber on an active VoLTE call moves out of LTE coverage into an area served only by 3G or 2G. Without SRVCC, the call would simply drop when LTE signal fades. SRVCC performs a coordinated handover that transfers the voice session from the LTE packet-switched domain to the legacy circuit-switched domain, moving both the radio connection and the call control anchor so the conversation continues without interruption.