Gatekeeper in Call Manager Networks

Of all the CAC mechanisms discussed in this chapter, gatekeeper zone bandwidth is the only method applicable to multi-site distributed CallManager clusters. In this scenario, the CallManager behaves like a VoIP gateway to the H.323 gatekeeper, as is shown in Figure 8-27.

Figure 8-27 Gatekeeper in a CallManager Topology

Figure 8-27 Gatekeeper in a CallManager Topology

In this example, the CallManager in Zone 2 requests the WAN bandwidth to carry a voce conversation from the gatekeeper on behalf of the IP Phone x2111. The gatekeeper determines whether each zone has sufficient bandwidth to establish the call. If the gatekeeper allows the call to proceed, the CallManager in Zone 2 contacts the CallManager in Zone 1 to begin call setup. If the gatekeeper rejects the call, the CallManager in Zone 2 can reroute the call over the PSTN to reach the called party.

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