Configuring Isdn Caller Identification Callback - 3Com MSR 50 Series Configuration Manual

174 C 6: DCC C
HAPTER ONFIGURATION
n
Configuring ISDN Caller
Identification Callback
To do...
Configure a dial string for
callback
To leave enough time for a server to call back, the interval between two calls on
the client need to be at least 10 seconds longer than that of the server. It is
recommended that the interval on the server be set to 5 seconds (the default) and
that on the client be set to 15 seconds.
In an ISDN environment, implementing DCC callback through ISDN caller
identification function does not require authentication configuration.
This section covers these topics:
"Features of ISDN caller Identification callback" on page 174
■
"Configuring ISDN caller identification callback with C-DCC" on page 175
■
"Configuring ISDN caller identification callback with RS-DCC" on page 176
■
Features of ISDN caller Identification callback
1 In the applications of ISDN caller Identification callback, the callback server can
process an incoming call in three ways, depending on the result of matching the
dial-in number against numbers configured in dialer call-in commands at the
local end:
Deny the incoming call, if one or multiple dialer call-in commands exist, but
■
no match is found.
Accept the incoming call, if the call-in number matches a dialer call-in
■
command without the callback keyword or if no dialer call-in command
exists.
Call back, if the call-in number matches a dialer call-in command with the
■
callback keyword.
2 Dial-in numbers are matched against numbers configured in dialer call-in
commands starting with the right-most character. In addition, asterisks (*) are
used as wildcards to match any character. If a dial-in number matches multiple
dialer call-in commands, the best match is selected in the following order:
The one with the fewest asterisks (*).
■
The one that is found first.
■
3 At the server end, identify the dialer call-in commands matching incoming calls
In C-DCC, upon receipt of an incoming call, the server compares the incoming
■
number against the dialer call-in commands configured on the physical dial
interface or its corresponding dialer interface for a match.
In RS-DCC, upon receipt of an incoming call, the server compares the incoming
■
number against the dialer call-in commands configured on the involved dialer
interface for a match.
Use the command...
service-type ppp
[ callback-nocheck |
callback-number
callback-number |
call-number call-number
[:subcall-number ] ]
Remarks
Required
When placing a return call,
DCC identifies which dial
string to be used according to
the remote username
obtained through PPP
negotiation.