Cisco WS-X4604-GWY - VoIP Gateway Especificaciones descargar pdf (Pagina 167)

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Cisco IP Telephony Network Design Guide

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Chapter 7 Multisite WAN with Centralized Call Processing

Dial Plan Considerations

does not use E.164 addresses in the admission request (ARQ) when it queries

the gatekeeper for admission. This restriction may change in future releases

of Cisco CallManager.

Dial Plan Considerations

A centralized call processing cluster must be able to handle three primary types

of calls:

• Intracluster calls between IP phones within the cluster.

• Intercluster calls between Cisco CallManager clusters.

• PSTN calls through a local gateway at each site.

In this section, generalized design guidelines are provided for each of these cases.

Note Where location-based call admission control is used, automatic

alternate routing through the PSTN is not possible. Instead, the

calling party hears a busy tone and, on devices with a display, sees

an out-of-bandwidth message.

Interlocation Calls

Interlocation calls are generally made between IP phones and other devices such

as fax machines and analog phones connected to gateway devices based on Media

Gateway Control Protocol (MGCP) or the Skinny Gateway Protocol. As within a

cluster, all devices register with a single Cisco CallManager so that the

availability of all devices is known. When a call is attempted, the outcome is one

of the following:

• The call succeeds.

• A busy tone is issued due to the remote device being active.

• A busy tone is issued due to insufficient WAN resources. A configurable

message is also displayed on the device.

No configuration of a dial plan is required for intracluster calls in the majority of

cases.

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Cisco WS-X4604-GWY - VoIP Gateway Especificaciones Pagina 167