本文详细介绍了SRVCC（Single Radio Voice Call Continuity）技术的各种类型及其应用场景，包括aSRVCC、bSRVCC、eSRVCC、rSRVCC、vSRVCC及mid-call SRVCC等，并解释了DRVCC的概念。
aSRVCC = SRVCC during alerting stage
bSRVCC = SRVCC before alerting stage
eSRVCC = enhanced SRVCC, which is a network feature for reducing audio delay from SRVCC
rSRVCC = SRVCC in the reverse direction CS call to VoLTE call
vSRVCC = Single Radio Video Call Continuity
mid-call SRVCC = SRVCC which allows both active and held calls to be transferred from VoLTE calls to CS calls
DRVCC = Dual Radio Voice Call Continuity
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