Cisco WS-X4604-GWY - VoIP Gateway Especificaciones descargar pdf (Pagina 166)

Chapter 7 Multisite WAN with Centralized Call Processing

Call Admission Control

7-4

Cisco IP Telephony Network Design Guide

78-11103-03

restricted to using gateways based on Skinny Gateway Protocol. You can now use

Cisco IOS gateways based on H.323 or MGCP for media stream termination, and

use of Media Termination Point (MTP) is no longer required.

Table 7-1 details the common branch gateways and minimum Cisco IOS releases.

In addition, bandwidth configured for a given location must be equal to or less

than the configured queue for voice on the wide area links. The preferred method

of queuing is low latency queuing, which is covered in more detail in the

Chapter 8, “Quality of Service.”

Caveats for Locations-Based Call Admission Control

The following caveats should be considered when using locations-based call

admission control:

• Moving devices between locations is not possible because

Cisco CallManager keeps track of the bandwidth for the specified location,

not the physical location, of the device.

• Cisco CallManager Release 3.0(5) installations with centralized call

processing are limited to hub-and-spoke topologies.

• Where more than one circuit or virtual circuit exists to a spoke location, the

bandwidth should be set according to the dedicated resources allocated on the

smaller link.

• The Cisco IOS gatekeeper can provide admission control for calls between

Cisco CallManagers only. The gatekeeper cannot provide admission control

between a Cisco CallManager and a remote Cisco IOS gateway. An example

would be if a Cisco CallManager at one site wanted to call another site where

there is an Cisco IOS gateway connected to a PBX. The Cisco CallManager

Table 7-1 Cisco IOS Minimum Releases for IOS Gateway Platforms

Platform Minimum Cisco IOS Release

Cisco 1750 12.1.(1)T

Cisco 2600 12.0.(7)T

Cisco 3600 12.0.(7)T

Cisco MC 3810 v3 12.0.(7)XK

1 2 ... 161 162 163 164 165 166 167 168 169 170 171 ... 261 262

Sin comentarios

Cisco WS-X4604-GWY - VoIP Gateway Especificaciones Pagina 166