Single Zone Topology

Figure 8-22 Simple Single-Zone Topology

Gatekeeper

Figure 8-22 Simple Single-Zone Topology

Gatekeeper

Call 2 Is Allowed

Call 3 Is Denied

Call 2 Is Allowed

Call 3 Is Denied

Most networks, however, are not as simple as the one shown in Figure 8-22. Figure 8-23 shows a more complex topology; however, it is still configured as a single-zone network. In this topology, the legs in the WAN cloud each have separate bandwidth provisioning and therefore separate capabilities of how many voice calls can be carried across each leg. The numbers on the WAN legs in Figure 8-23 show the maximum number of calls that can be carried across each leg.

Figure 8-23 Complex Single-Zone Topology

Zone Bandwidth of 128 kbps Will Not Scale Gatekeeper

Zone Bandwidth of 128 kbps Will Not Scale Gatekeeper

Remote Site 1

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Remote Site 2

Assume that the gatekeeper zone bandwidth is still configured to allow a maximum of 128 kbps, limiting the number of simultaneous calls to two.

With a single zone configured, the gatekeeper protects the bandwidth of the WAN link from Site 1 to the WAN aggregation point by not allowing more than two calls across that link. When two calls are in progress, however, additional calls between the PBXs at Headquarters are blocked even though there is ample bandwidth in the campus backbone to handle the traffic.

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