Why SRVCC is send in the initial context setup request message for an UE?

Question

and what eNodeB does, when it receives SRVCC IE in the initial context setup request message ?

Answer 1

I know little bit,
SRVCC stands for Single Radio Voice Call Continuity.This information sending in initial context setup request message is just to inform eNB that handover between VoIP over IMS in LTE and WCDMA is possible .So during VOIP cal if UE moves out of LTE coverage area and neighbor is UMTS then eNB will notify to LTE core network/IMS.So voice call be continued.