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Understanding the dial plan

Cisco TelePresence ISDN Gateway 2.1 Online help (Printable format) 19 of 135

Understanding the dial plan

The Cisco TelePresence ISDN Gateway uses the dial plan to determine how to route calls between IP

and ISDN networks. When the ISDN Gateway receives a request to initiate a new IP to ISDN or ISDN to

IP call, it examines the called number (if available), and uses the dial plan to determine whether to reject

the call, find out which number should be called to initiate the outgoing part of the call, and to check the

allowed call bandwidth.

There are a number of different ways in which you can use the dial plan. For example, you can use the

dial plan to enable callers to use a particular bandwidth for an IP to ISDN call. You can also use the dial

plan to enable the ISDN Gateway to join incoming ISDN calls to the correct conference on an MCU. (For

example dial plans, refer to

Example dial plan rules.)

The dial plan is actually divided into two; an IP to ISDN dial plan and an ISDN to IP dial plan. If the

incoming part of a connection is from an IP endpoint, the IP to ISDN dial plan is used; if it is from an ISDN

endpoint, the ISDN to IP dial plan is used. The behavior of the two dial plans is nearly identical, and the

sections below only make a distinction between the two where differences exist.

The maximum number of rules that can be added to each dial plan is 200.

Note that if you have configured the ISDN Gateway to use leased line mode, then the options available

on the dial plan are different to those available in non-leased line mode. For information about configuring

dial plans in leased line mode, refer to

Adding and updating dial plan rules in leased line mode.

Refer to the sections below for more information about the use and administration of dial plans:

 Rules

 Using rules

 Rule ordering

Rules

Dial plans are administered using rules. Rules and their addition and control are nearly identical for the IP

to ISDN and ISDN to IP dial plans.

Each rule has a name and comprises:

 a Condition that must be matched for the rule to be invoked

The condition can be set to match any called number, to match a call that has no called number,

or can specify the called number by specific number or pattern.

 an Action that is carried out if the rule is invoked

The action can be to reject the call, enter the auto attendant, enter the auto attendant and use a

TCS-4 extension (ISDN to IP only), to place the call using the original dialed number, or to

specify the number/address to call.

 a set of Additional parameters that modify the action:

o Call type: specifies whether the call is a normal video call, a telephone call, or a video

call that supports legacy ISDN endpoints that use n x 64kbps or n x 56kbps

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Cisco Systems D14659.03 Manual do Utilizador Página 19