Cisco WS-X4604-GWY - VoIP Gateway Especificaciones descargar pdf (Pagina 146)

Chapter 6 Multisite WAN with Distributed Call Processing

Dial Plan Considerations

6-16

Cisco IP Telephony Network Design Guide

78-11103-03

Anonymous Device. This device can be thought of as a point-to-multipoint trunk,

which removes the necessity for the meshed point-to-point trunks in the

Cisco CallManager dial plan model. The Anonymous Device uses the gatekeeper

to route calls to the correct Cisco CallManager cluster. If there is no requirement

for automatic overflow or failover to the PSTN, then the dial plan in each cluster

could be simplified to only two route patterns: one for intercluster calls and one

for PSTN access. In this model, you configure the dial plan in the gatekeeper, thus

providing a central point of administration. As new clusters are added, you update

only the gatekeeper instead of every Cisco CallManager.

In summary, the three dial plan models provide the following features and

capabilities:

• Cisco CallManager dial plan model (See the “Using Cisco CallManager to

Route Calls” section on page 6-17.)

–

Automatic overflow and failover to the PSTN, using the gatekeeper only

for call admission control.

–

Requires a separate intercluster trunk for each combination of two

Cisco CallManager clusters.

–

Requires two routes for each Cisco CallManager destination, one for the

IP WAN and one for the PSTN.

–

You must reconfigure every Cisco CallManager if a new cluster is added

or the dial plan changes.

• Hybrid dial plan model

–

Automatic overflow and failover to the PSTN, using the gatekeeper for

call admission control and the intercluster dial plan.

–

Requires only one Anonymous Device in each Cisco CallManager

cluster.

–

Requires two routes for each Cisco CallManager destination, one for the

IP WAN and one for the PSTN.

–

You configure the intercluster dial plan in both the gatekeeper and the

Cisco CallManager.

• Gatekeeper dial plan model (See the “Using the Gatekeeper to Route Calls”

section on page 6-19.)

–

Manual overflow and failover to the PSTN, using the gatekeeper for call

admission control and the intercluster dial plan.

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