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This figure shows a call flow between, from left to right, a Client Application, Signaling Engine a PCRF, and a SIP Server. The messages include, in order from top to bottom:
Client to Signaling Engine: Handshake.
Signaling Engine to Client: Handshake response.
Client to Signaling Engine: connect.
Signaling Engine to SIP Server: REGISTER.
SIP Server to Signaling Engine: 200/OK.
Signaling Engine to Client: connect/response.
Client to Signaling Engine: start.
Signaling Engine to SIP Server: INVITE.
SIP Server to Signaling Engine: 180/trying.
Signaling Engine to Client: start/initial response.
SIP Server to Signaling Engine: 200/OK.
Signaling Engine to Client: start/final response.
Client to Signaling Engine: complete.
Signaling Engine to PCRF: Diameter Rx-AAR.
PCRF to Signaling Engine: Diameter Rx-AAA.
Signaling Engine to SIP Server: ACK.
The Media Session starts between the Client and an unpictured SIP end point.
SIP Server to Signaling Engine: BYE.
Signaling Engine to SIP PCRF: Diameter Rx-STR.
PCRF to Signaling Engine: Diameter Rx-STA.
Signaling Engine to Client: shutdown.
Signaling Engine to SIP Server: 200/OK.