Avaya Configuring Dial Services Manual de usuario descargar pdf (Pagina 259)

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Customizing Demand Circuits

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Enabling Callback

Callback is a feature for use between two peer routers, such as a central router and

a remote router, over a PPP circuit. It lets you configure a router to call back an

incoming caller. You cannot use callback with frame relay demand circuits or

demand circuit groups.

Note the following guidelines:

• If the router is set to Server, Client, or Server Call ID, the router performs

CHAP or PAP authentication when it receives a call.

• The one-charge modes ensure that only the server side of the callback

connection incurs phone charges. When you choose any of these options, the

server refuses the call from the client, eliminating charges for the client’s

initial call, but charging the server for its return calls to the client.

• To use any of the one-charge modes, each remote site must have a unique

phone number. The server must be able to identify a single circuit for each

phone number that it calls back.

• If you want to reduce your configuration work and you can purchase

caller ID service, select the modes that use Call ID. These modes do not

require an outgoing phone list to place a call; they rely only on the phone

number in the call setup message.

• If you cannot use caller ID or the phone number in the call setup message is

not sufficient to place an outgoing call (for example, you have to dial 9 to get

an outside line), do not select a Call ID mode. For more information about

callback, see Chapter 6, “Dial-on-Demand Implementation Notes.”

Modifying the Callback Mode Parameter

If you modify the Callback Mode parameter, be aware of the following:

• The server or client delay time resets.

If you change from a server mode to a client mode, or from a client mode to a

server mode, the associated callback delay time resets to its default value.

For example, if you change the callback mode from server to client, and the

callback server delay Time was set to 5 seconds, this time resets to the default

value of 0. Conversely, if you change the callback mode from client one

charge to server one charge, the callback client delay time resets to its default

value of 5 seconds.

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