Cisco WS-X4604-GWY - VoIP Gateway Especificaciones descargar pdf (Pagina 129)

5-21

Cisco IP Telephony Network Design Guide

78-11103-03

Chapter 5 Dial Plan Architecture and Configuration

The Role of a Gatekeeper

This configuration assumes that 1+10 digit dialing would be required for

long-distance calls to the PSTN, and 7-digit dialing would be required for local

PSTN calling.

Although the scope of the 9.@ route pattern includes emergency 911 services, the

Cisco IOS H.323 gateway still requires a dial peer for 911. Various dial peers can

be added for 411 and 611 services, which are included in the scope of the 9.@

route pattern as well.

As noted earlier in the “Outbound Calls Through the PSTN” section on page 5-12,

local area codes should be configured specifically with a route pattern and should

not require a 1.

Multi-Site WAN Dial Plans

Dial plans for multi-site WAN systems are covered in Chapter 6, “Multisite WAN

with Distributed Call Processing,” and Chapter 7, “Multisite WAN with

Centralized Call Processing.”

The Role of a Gatekeeper

Within a distributed call processing environment, you can use a gatekeeper to

achieve call admission control across the WAN. With the introduction of

Cisco CallManager Release 3.0(5), you can also use a gatekeeper to simplify dial

plans between Cisco CallManagers.

For example, assume you have two Cisco CallManager servers connected via a

WAN. One Cisco CallManager has an extension range of 1XXX and the other

2XXX, and both register to a gatekeeper for call admission control. Each

Cisco CallManager has an appropriate entry in its respective dial plan Route

Pattern Configuration that uses the Anonymous Calls Device feature to point the

other Cisco CallManager’s extension number range to the gatekeeper. In practice,

when subscriber 1001 dials subscriber 2002, Cisco CallManager 1XXX sends

2002 to the gatekeeper for address resolution. The gatekeeper in turn sends the IP

address of Cisco CallManager 2XXX to Cisco CallManager 1XXX to ascertain

the IP address for subscriber 2002. If the call admission control criteria are met,

the gatekeeper allows the call to be established. Figure 5-9 illustrates this

example.

1 2 ... 124 125 126 127 128 129 130 131 132 133 134 ... 261 262

Sin comentarios

Cisco WS-X4604-GWY - VoIP Gateway Especificaciones Pagina 129