Cisco WS-X4604-GWY - VoIP Gateway Especificaciones descargar pdf (Pagina 165)

7-3

Cisco IP Telephony Network Design Guide

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Chapter 7 Multisite WAN with Centralized Call Processing

Call Admission Control

Where centralized call processing is used, call admission control is provided

using the locations construct. Under this scheme, locations are created with a

geographical correspondence, such as a branch office. For example, a location

could be designated as Branch 1, Mountain View Office. (A postal zip code could

also be used.) The location should correlate to a geographical location that is

serviced by a wide area link. A maximum bandwidth to be used by interlocation

voice calls is then specified for the location. Devices within that location are then

designated as belonging to that location. See Figure 7-2.

Figure 7-2 Cisco CallManager Location Configuration

The centralized Cisco CallManager keeps track of the current amount of

bandwidth consumed by interlocation voice calls from a given location. If a new

call across the IP WAN tries to exceed the configured setting, a busy signal is

issued to the caller as well as a configurable visual display, such as “All Trunks

Busy,” on devices with this capability. If the caller gets a busy signal, the caller

must hang up the phone and dial the access code for that location’s PSTN gateway

to facilitate an outgoing call.

Unlike previous versions of Cisco CallManager, each location in

Cisco CallManager Release 3.0 can use a common access code for its local PSTN

gateway. This is discussed in more detail in the “Dial Plan Considerations”

section on page 7-5. In addition, Cisco CallManager Release 3.0 is no longer

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Cisco WS-X4604-GWY - VoIP Gateway Especificaciones Pagina 165