RSVPH323 Synchronization

Voice gateways use H.323 signaling when setting up voice calls. To reserve network resources for voice calls with RSVP, RSVP in an H.323 environment operates by synchronizing its signaling with H.323 version 2 signaling. This synchronization ensures a bandwidth reservation is established in both directions before a call moves to the alerting, or ringing, H.323 state. RSVP and H.323 version 2 synchronization provides the voice gateways with the capability to modify H.323 responses based on current network conditions. These modifications allow a gateway to deny or reroute a call in the event that QoS cannot be guaranteed.

Figure 8-32 shows a call flow of the H.323 call setup messages and the RSVP reservation messages.

Figure 8-32 RSVP Call Setup for an H.323 Voice Call

Figure 8-32 RSVP Call Setup for an H.323 Voice Call

RSVPRESVMessage

In this example, the originating gateway initiates a call to the terminating gateway with an H.225 setup message. The terminating gateway responds with a call proceeding message. Because voice conversations require a bidirectional traffic stream, each gateway initiates a reservation request by sending an RSVP path message. An RSVP resv message is sent in response indicating that the requested reservation has been made. The originating gateway sends an RSVP resvconf message to the terminating gateway confirming the reservation. At this point, the terminating gateway proceeds with the H.323 call setup by sending an alerting message to the originating gateway.

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