This figure shows a call flow diagram between these entities shown from left to right: Client Application, Signaling Engine, Media Engine, IMS Core, and SIP Endpoint. It shows these messages:
Client to Signaling Engine: Start
with SDP1.
Signaling Engine to Media Engine: createSdpOffer
.
Media Engine to Signaling engine: SDP2.
Signaling Engine to IMS Core: INVITE
with SDP2.
IMS Core to SIP Endpoint: INVITE
with SDP2.
SIP Endpoint to IMS Core: 200 with SDPa
.
IMS Core to Signaling Engine: 200/OK
with SDPa
Signaling Engine to Media Engine: createSdpAnswer
Media Engine to Signaling Engine: SDPb
Signaling Engine to Client: Start
response with SDPb.
The Media Session occurs between the Client and the SIP Endpoint.
SIP Endpoint to IMS Core; BYE
.
IMS Core to Signaling Engine: BYE
.
Signaling Engine to Media Engine: createReleaseRequest
.
Media Engine to Signaling Engine: OK
.
Signaling Engine to Client: shutdown
.