Cisco WS-X4604-GWY - VoIP Gateway Especificaciones descargar pdf (Pagina 118)

Chapter 5 Dial Plan Architecture and Configuration

Special Dial String Considerations

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Cisco IP Telephony Network Design Guide

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Digit translation can also be performed within the route pattern structure using

called/calling party transformation, which performs the same digit translation

functions for both incoming and outgoing calls. This means that within a route

pattern, three types of digit manipulation can be performed on a called number:

• Discard digits

• Apply called-party transformation mask

• Prefix digits

In the following example, a route pattern of 2.XXXX is defined. The calling

number is 1000, but the call needs to go to a PBX with a called party number of

444XXXX and a calling party number of 919392XXXX. The Cisco CallManager

route pattern would be treated as follows:

Step 1 Apply the calling party transformation mask of 919392XXXX. This prefixes

91939 to the calling number.

Step 2 Discard the access code (2), leaving just XXXX.

Step 3 Prefix the digits 444.

An alternative way to accomplish steps 2 and 3 would be to use a called-party

transformation mask of 444XXXX.

It is important to keep in mind that the calling party transformation mask applies

only to the calling numbers, while the other masks apply to the called numbers.

Cisco CallManager first discards digits, then applies the transformation mask,

and finally prefixes digits.

Special Dial String Considerations

You should try to make your dial plan as simple as possible and to minimize the

number of entries. The most efficient way to achieve this is to configure specific

dial plans only for locations on the network (IP WAN) and to use the local PSTN

gateway access code, such as 9 or 0 (zero), for locations that must be reached over

the PSTN, as well as for IP WAN calls if the IP WAN is down or has insufficient

resources. These are called on-net and off-net route patterns, respectively.

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Cisco WS-X4604-GWY - VoIP Gateway Especificaciones Pagina 118