Configuring Isdn Caller Number Callback; Overview - HP MSR Router Series Wan Access Configuration Manual

Configuring the callback server by using bundle DDR
Step
1. Enter system view.
2. Enter dialer interface view.
3. Enable the interface to accept
callback requests.
4. Configure the interface to
determine the dial string for
callback according to the
authenticated username.
5. Exit to system view.
6. Create a local user and enter
local user view.
7. Configure a dial string for
callback.

Configuring ISDN caller number callback

This feature allows the device to perform the following tasks:
Screen incoming calls based on the ISDN caller number.
•
Determine whether to accept a call or initiate a callback according to the screening results.
•
A callback is a return call from the call receiver (server) to the call initiator (client). The client initiates a
call, and the server determines whether to initiate a callback to the client. If yes, the server disconnects
the call and places a return call to the client.

Overview

The callback feature has the following benefits:
• Enhanced security—The server initiates a return call to the number configured locally, which
prevents caller number spoofing.
Reduced charges—The charge payer can be changed when the charge rates are different in the
•
two directions.
ISDN caller number callback uses the following process:
1. When a server receives a call, it determines the configured dialer call-in command relevant to the
dial-in number.
For traditional DDR, the server queries the relevant dialer call-in command from the dialer
call-in commands configured on the physical interface or the corresponding dialer interface
receiving the call.
For bundle DDR, the server queries the relevant dialer call-in command from the dialer call-in
commands configured on the dialer interface receiving the call.
2. The system matches the dial-in number with the number configured in the dialer call-in command,
by using rightmost matching.
Command
system-view
interface dialer number
ppp callback server
dialer callback-center dial-number
quit
local-user user-name class network
service-type ppp
authorization-attribute
callback-number callback-number
188
Remarks
N/A
N/A
By default, an interface does not
accept callback requests.
By default, callback is not
performed.
N/A
N/A
By default, no dial string for
callback is associated with a local
user.