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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