Avaya Configuring Dial Services Manual do Utilizador descarregar pdf (Página 142)

100

101

Configuring Dial Services

6-8

117353-B Rev. 00

Callback

Callback is a dial-on-demand feature for use between two peer routers, such as a

central router and a remote router, over a PPP circuit. You cannot use callback

with frame relay demand circuits or demand circuit groups.

With this feature, you can configure a router to call back an incoming caller. You

can configure callback across any demand circuit, including those configured for

bandwidth-on-demand service.

Callback offers the following advantages:

• Reduces tariffs because you can place calls using the lowest cost path

• Secures access for authorized callers only

• Consolidates accounting of phone charges

Figure 6-1

shows how callback works.

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.

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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