SR-VCCSingle Radio Voice Call Continuity
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To ensure that this doesn't happen, the VoLTE standard provided a functionality called Single Radio Voice Call Continuity (SR-VCC), that ensures interoperability.
It is a standard IMS Session Border Controller (SBC) that supports the latest 3GPP features needed to introduce new services such as RCS/RCS-e and VoLTE services, including SR-VCC. Additionally, it is a WebRTC Gateway that supports network services, web APIs and media mixing needed to extend IMS-based services to the web.