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ppp callback ntstring 
Use ppp callback ntstring to specify a dial string for a Windows server to call back. 
Use undo ppp callback ntstring to restore the default. 
Syntax 
ppp callback ntstring dial-number 
undo ppp callback ntstring 
Default 
No callback dial string is specified. 
Views 
Dialup interface view 
Predefined user roles 
network-admin 
Parameters 
dial-number: Specifies the dial string, a case-sensitive string of 1 to 64 characters. 
Usage guidelines 
Configure this command on the callback client if the Windows server requires PPP callback clients to 
send callback numbers. 
Examples 
# Specify a dial string of 1234567 for the Windows server to call back. 
<Sysname> system-view 
[Sysname] interface dialer 1 
[Sysname-Dialer1] ppp callback ntstring 1234567 
reset counters interface 
Use reset counters interface to clear the statistics of a dialer interface. 
Syntax 
reset counters interface [ dialer [ interface-number ] ] 
Views 
User view 
Predefined user roles 
network-admin 
Parameters 
dialer: Specifies dialer interfaces. 
interface-number: Specifies a dialer interface by its number. 
Usage guidelines 
Use this command to clear history statistics if you want to collect traffic statistics for a specific time 
period. 
If you do not specify the dialer keyword, this command clears statistics for all interfaces. 
If you specify the dialer keyword, this command clears statistics for all dialer interfaces.