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Configuring Dial Services
5-8 114062 Rev. B
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
5-1 shows how callback works.
Figure 5-1. 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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