3Com MSR 50 Series Configuration Manual page 171

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Configure PPP callback after completing the basic configuration of C-DCC or
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RS-DCC.
PPP callback implementation requires authentication. You are recommended to
■
configure PAP or CHAP authentication on both physical and dialer interfaces on
both callback client and server.
With dynamic route backup configured on an interface, only the dynamic route
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backup groups are used for dial. In this case, the interface does not accept
incoming calls or outgoing calls. So, do not configure dynamic route backup
groups for interfaces with callback configured.
Two approaches are available to configuring PPP callback with DCC:
"Configuring PPP callback in the C-DCC implementation" on page 171
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"Configuring PPP callback in the RS-DCC implementation" on page 173
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Configuring PPP callback in the C-DCC implementation
Configuring PPP callback in C-DCC involves configuring PPP callback client and
server.
1 Configure PPP callback client in the C-DCC implementation
As a callback client, your router can place calls to the remote end (which can be a
router or Windows NT server with the PPP callback server function), and receive
return calls from the remote end.
Follow these steps to configure PPP callback client in the C-DCC implementation:
To do...
Enter system view
Enter dialer interface view
Enable PPP encapsulation
Configure authentication
parameters
Enable PPP callback client
Configure the dial string for a
Windows NT Server to call
back
Set the interval between two
calls
2 Configure PPP callback server in the C-DCC implementation
As a callback server, your router can place return calls according to network
addresses configured with the dialer route command (PPP authentication must
be configured in this case), or according to dial strings configured with the
Use the command...
system-view
interface dialer
interface-number
link-protocol ppp
See "Configuring PPP" on
page 367 for related
information.
ppp callback client
ppp callback ntstring
dial-number
dialer timer enable seconds Optional
DCC Configuration 171
Remarks
--
--
Required
Required
Required
Disabled by default
Optional
Not configured by default.
Configure this command if a
Windows NT Server requires
PPP callback clients to send
callback numbers.
15 seconds is recommended.