3com 3031 Instruccion De Instalación

By default, the system does not enable the callback function.

Callback users can be authenticated not only by username/password but also by 
callback number.

By default, neither callback number nor authentication is set.

In an ISDN environment, implementing DCC callback through the ISDN caller 
identification function requires no authentication, nor are there other 
configurations requirements.

1 I

n the applications of ISDN caller Identification callback, the callback server can process 

an incoming call in three ways, depending on the matching result of the calling 
number and the dialer call-in command at the local end:

■

Denies the incoming call: The 

 command has been configured, 

but no match is found for the dial-in number and the configured dialer callers.

■

Accepts the incoming call: The 

 command is not configured, 

or a match is found for the dial-in number and a 

command 

configured without the keyword “

”.

■

Calls back: The 

command has been configured, and a match 

is found for the dial-in number and a 

 

command.

2 The match for the incoming number and the dialer call-in commands is 

determined on the basis of right-most matching. The character “*” in the number 
represents any characters. If multiple dialer call-in commands match the incoming 
number, the following rules will apply for determining the best match:

■

Primary rule: The best match is the number with the fewest “

*

”.

■

Secondary rule: The best match is the one that is found first.

3 Confirm the dialer call-in at server end is associated with the incoming call

Disable the callback server function 
of the router

Table 1129   Configuring local user authentication for PPP callback

Configure username and password

local-user local-user [ password { simple 

| cipher } password ]

Remove a user

Configure user callback 
authentication

local-user local-user callback-nocheck

Cancel user callback authentication

Set callback attribute

local-user local-user callback-number 

Delete callback attribute

Table 1128   Implementing PPP callback (server configuration) in Resource-Shared DCC