Avaya Configuring Dial Services Instrukcja Użytkownika Pobierz pdf (Strona 148)

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Configuring Dial Services

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308621-14.00 Rev 00

Figure 6-1. Example of Callback over a Demand Circuit

Remote router A places a call to central router B. Router B determines whether

the caller is authorized and, if so, terminates the initial call. Router B then places a

return call to router A.

Configuring Callback

Callback operates on a per-demand-circuit basis. You enable callback by

configuring the callback mode parameter. This parameter assigns each end of a

callback circuit the role of server or client. If you do not want to use the callback

feature, you accept the default callback mode, Inactive.

The server responds to each incoming call from the client, and either authenticates

the call using CHAP or PAP or identifies the caller using the incoming filtering

feature. The server disconnects or refuses the call, then redials the client using one

of the following options:

• The outgoing phone list

The outgoing phone list is a user-defined list containing the phone numbers of

remote routers. Each number in the outgoing phone list is associated with a

specific circuit.

• Caller ID, also called Automatic Number Identification (ANI)

Caller ID is an ISDN service that you purchase from an ISDN service

provider. When you purchase caller ID, the phone number of the caller is

placed in the call setup message. The network switch must also support caller

ID.

Demand circuit

Remote Router A

Central Router B

DS0032A

ISDN

1. Initiate call

3. Disconnect or refuse call

4. Call back

5. Accept call

2. Authenticate caller

Client

Server

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