Configuring The Callback Client - HPE FlexNetwork MSR series Configuration Manual

return call. If a return call is needed, the callback server disconnects the call and places a return call
according to the username or callback number.
PPP callback has the following benefits:
•
Enhanced security—The server places a return call to the locally configured number, which
prevents caller number spoofing.
•
Reduced charges—The charge payer can be changed when the charge rates are different in
the two directions.
When you configure PPP callback on an interface, follow these restrictions and guidelines:
•
PPP callback requires authentication. Configure PAP or CHAP authentication on both physical
and dialer interfaces on the callback client and server.
•
To provide enough time for callback, make sure the holddown timer on the client is 10 or more
seconds longer than that on the server. As a best practice, set the holddown timer to 5 seconds
(the default) on the server and to 15 seconds on the client.
•
Do not configure dynamic route backup on the interface. Otherwise, the interface does not
accept incoming calls or outgoing calls other than calls initiated for the dynamic route backup
feature.

Configuring the callback client

The callback client can place calls to the remote end and receive return calls from the callback
server. The callback server can be a router or Windows server that supports the callback server
feature.
You can configure the callback client to use traditional DDR or bundle DDR.
Configuring the callback client by using traditional DDR
Step
1. Enter system view.
2. Enter dialup interface view.
3. Enable the interface to send
callback requests.
4. (Optional.) Configure the dial
string for a Windows server
to call back.
Configuring the callback client by using bundle DDR
Step
1. Enter system view.
2. Enter dialer interface view.
3. Enable the interface to send
callback requests.
4. (Optional.) Configure the dial
string for a Windows server
to place return calls.
Command
system-view
interface interface-type
interface-number
ppp callback client
ppp callback
dial-number
Command
system-view
interface dialer number
ppp callback client
ppp callback
dial-number
178
Remarks
N/A
N/A
By default, an interface does not
send callback requests.
By default, no dial string is
configured for a Windows server
to call back.
ntstring
Configure this command if the
Windows server requires callback
clients to send callback numbers.
Remarks
N/A
N/A
By default, an interface does not
send callback requests.
By default, no dial string is
configured for a Windows server
ntstring
to call back.
Configure this command if a