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.

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