Cisco WS-X4604-GWY - VoIP Gateway Spezifikationen PDF herunterladen (Seite 147)

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Cisco IP Telephony Network Design Guide

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Chapter 6 Multisite WAN with Distributed Call Processing

Dial Plan Considerations

–

Requires only one Anonymous Device in each Cisco CallManager

cluster.

–

Requires only two route patterns, one for intercluster calls to all locations

and one for PSTN access.

–

You configure the dial plan in the gatekeeper (not in every

Cisco CallManager) to route intercluster calls.

–

Users must dial the correct PSTN number to access a remote site if the IP

WAN is down or is busy.

Using Cisco CallManager to Route Calls

In the example depicted in Figure 6-9, users dial five digits for internal calls and

seven digits for intersite calls across the IP WAN. If the IP WAN is down or has

insufficient resources, the PSTN is used transparently for intersite calls. For

long-distance calls that will be directed to the PSTN, users dial the access code 9

followed by 1 + area code and the 7-digit number. Users dialing local PSTN calls

dial 9 plus the 7-digit number. This model also provides gateway redundancy in

the event of a gateway or trunk failure to the PSTN. The PSTN gateways are

Cisco IOS gateways using H.323.

Note This section deals only with intersite IP WAN calls that are intended

to traverse the IP WAN as the first choice and use the PSTN as the

second choice. See the “Outbound Calls Through the PSTN” section

on page 5-12 for POTS-only calls.

The goal of this dial plan is to dial the San Jose location using only seven digits,

where calls take the IP WAN as the first choice and the PSTN as the second

choice. Thus, users in Philadelphia can dial San Jose users at (408) 526-XXXX

by simply dialing 526XXXX.

This configuration begins at the route pattern. A route pattern is entered as

52.6XXXX with an assigned route list as SJ. The location of the dot (.) signifies

that all digits to the left comprise the access code for this route pattern. Also, no

digit manipulation is selected or required because each route group needs to

invoke its own unique manipulation.

Figure 6-9 depicts the route pattern configuration for 52.6XXXX.

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Cisco WS-X4604-GWY - VoIP Gateway Spezifikationen Seite 147