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SRVCC의 종류
aSRVCC: Packet switched to Circuit Switched call transfer during Alerting Phase
bSRVCC: SRVCC before ringing
vSRVCC: SRVCC for video call
rSRVCC:r everse SRVCC HO from CS call to PS IMS
eSRVCC: 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/Handbook_LTE_SRVCC.html
→Protocol Sequence Example 도 있음!
www.exfo.com/library/technical-resources/webinars/testing-ims-volte-esrvcc
→SRVCC,eSRVCC관련 강의
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