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telecomtutorial.info
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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