SRVCC의 종류 aSRVCC: Packet switched to Circuit Switched call transfer during Alerting PhasebSRVCC: SRVCC before ringingvSRVCC: SRVCC for video callrSRVCC:r everse SRVCC HO from CS call to PS IMSeSRVCC: enhanced SRVCC Support of mid-call feature during SRVCC handover (eSRVCC) Support of SRVCC PS-CS transfer of a call in alerting phase (aSRVCC) SRVCC VS eSRVCC 참조 http://www.sharetechnote.com/html/Ha..