3Com 3C13618 Command Reference Manual page 846

3Com Router Command Reference Guide — V1.00
Parameter
dial-number: Dial number for a Windows NT server to call back the router.
Description
Using the ppp callback ntstring command, you can configure the dial number
required for a Windows NT server to call back the router. Using the undo ppp
callback ntstring command, you can cancel the configured callback dial number.
By default, no callback dial number is set for the Windows NT server.
When a router functions as the callback server to call a Windows NT server, this
command should be configured if the server needs the router to send the callback
number.
For related commands, see ppp callback.
Example
# Set the dial number for a Windows NT server to call back the router to "2489".
[3Com-Dialer1] ppp callback NTString 2489
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