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Dial-on-Demand Implementation Notes

117353-B Rev. 00

6-11

Using the Incoming Phone List for Callback Service

If the callback mode of your router is Server One Charge or Server One Charge

Call ID, the router uses incoming call filtering to identify the client, not PPP

authentication, which relies on the caller resolution table. Using incoming call

filtering, the router can maintain security while refusing the initial call from the

client. This saves the client phone charges. To enable incoming call filtering, see

Chapter 9.

When the server uses incoming filtering, it relies on the incoming phone number

to identify the client. When the server receives the call from the client, it matches

the client’s phone number with a phone number and circuit number in the

incoming phone list. The circuit number, specified in the Callback Demand

Circuit Name parameter, identifies the circuit that the server uses to place the

outgoing call back to the client.

The Callback Demand Circuit Name parameter is located in the Incoming Phone

List window. For configuration instructions, see “Creating an Incoming Phone

List (ISDN only)” on page 13-20.

Demand Circuit Groups

A demand circuit group is a set of demand circuits that share the same

user-defined, unnumbered protocol configuration. An unnumbered protocol

configuration does not restrict the router to a specific destination address. Instead,

it enables the router to use any circuit in the group for an incoming call,

eliminating the need to configure a unique demand circuit for each remote node in

the network. One demand circuit group supports many remote routers, thereby

reducing the configuration tasks for a large network.

Demand Pools and Demand Circuit Groups

Like individual demand circuits, a demand circuit group is associated with an

existing demand pool. The number of circuits in the demand circuit group must be

less than or equal to the number of lines in the demand pool. If you change the

number of lines in a demand pool, you must increase or decrease the number of

demand circuits in the group accordingly.

When the router activates a line from the demand pool, the circuits in a demand

circuit group also become available. The router does not bring up the circuits until

it receives an incoming call. Demand circuit groups can only receive calls.

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Avaya Configuring Dial Services Manual de usuario Pagina 145