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Cisco IP Telephony Network Design Guide

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Chapter 5 Dial Plan Architecture and Configuration

Special Dial String Considerations

On-Net Route Pattern

In a multisite IP WAN with distributed call processing, an abbreviation of the full

E.164 address is typically used for ease of dialing. For example, where an on-net

location has a number range of (408) 526-1000 through 1999, there may be only

a single route pattern with an entry of 61XXX. This simplifies user dialing and

requires only one route pattern entry where the Xs serve as wildcards.

To present the remote Cisco CallManager with the appropriate number of digits

for the internal dial plan, the Cisco CallManager route pattern can also strip or

prepend digits to the dialed number. In fact, the number of digits presented to a

remote Cisco CallManager for all calls across the IP WAN must match the dialed

digit length that the remote site uses for internal calls. The remote

Cisco CallManager simply looks at the digits and routes the call. There is no digit

manipulation for incoming calls.

If the IP WAN resources are insufficient in this environment and the call has to be

sent over PSTN, the route group for the PSTN gateway must insert the area code

and three-digit exchange. In earlier releases of Cisco CallManager, only one digit

manipulation table could be used for any given route pattern. Therefore, only

Cisco IOS gateways could be used because they could insert the area code and

three-digit exchange. This administrative burden has been removed in

Cisco CallManager Release 3.0, which now has the ability to perform unique digit

manipulations on a per-route-group basis. This allows for a single point of dial

plan administration per site and for use of both Cisco IOS gateways and gateways

based on the Skinny Gateway Protocol.

Figure 5-4 depicts on-net calls across the IP WAN with the PSTN as a backup,

where the digit manipulation required is different for each path.

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Cisco WS-X4604-GWY - VoIP Gateway Spezifikationen Seite 119