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VoLTE MO and MT Call Flow :- Covering VoLTE to VoLTE SIP IMS Call flow for Mobile Originating & Mobile Terminating Calls . It Provides extract of 3GPP / GSMA Specs simplified way
Originating Call Flow Sequence described in Video :-
SIP INVITE message : UE --to-- IMS
SIP 100 Trying : IMS --to-- UE
SIP 183 Progress SDP : IMS --to-- UE
SIP PRACK : UE --to-- IMS
SIP 200 OK PRACK : IMS --to-- UE
SIP UPDATE SDP : UE --to-- IMS
SIP 200 OK UPDATE : IMS --to-- UE
SIP 180 Ringing : IMS --to-- UE
SIP 200 OK INVITE : IMS --to-- UE
SIP ACK : UE --to-- IMS
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4. Volte call flow - SIP Call Flow - IMS Call procedure
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