BinTec X3200, User Manual

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280 BinTec Communications AG
Security Mechanisms
7
Callback offers the following selection options:
Table 7-9: Callback
Possible Values Meaning
no X3200 does not call back.
expected (awaiting call-
back) X3200 calls the WAN partner to initiate call-
back.
yes (PPP negotiation) X3200 calls back with the extension entered for
the WAN partner. If no number is entered, the
required number can be reported by the caller
in a PPP negotiation. This setting should be
avoided if possible for security reasons. How-
ever, no alternative is currently available for
connecting Microsoft
➤➤
clients over data
transmission networks.
yes (delayed) X3200 calls back after approximately four sec-
onds, if requested to by the WAN partner.
yes (PPP negotiation,
callback optional)
Corresponds to the value
yes (PPP
negotiation), but contains an abort option.
The Microsoft client has the option of aborting
callback and maintaining the initial connection
to
X3200 without callback. This is done by
pressing CANCEL to close the dialog box that
appears.
Exception: This abort option cannot be used if
the WAN partner dialing in uses Windows NT
and his extension number is entered in
X3200 .
yes X3200 calls back immediately, if requested to
by the WAN partner.
If yes (PPP negotiation) is used as the setting for Callback, a B-channel is
always opened, which results in costs.