Available settings are explained as follows:
Item
Dial-In Settings
47 characters.
Callback Function (CBCP) - (for s models only)
The callback function provides a callback service as a
part of PPP suite only for the ISDN dial-in user. The
router owner will be charged the connection fee by the
telecom.
Require Remote to Callback-Enable this to let the
router to require the remote peer to callback for the
connection afterwards.
Provide ISDN Number to Remote-In the case that
the remote peer requires the Vigor router to callback,
the local ISDN number will be provided to the remote
peer. Check here to allow the Vigor
Description
Allowed Dial-In Type - Determine the dial-in connection
with different types.
PPTP - Allow the remote dial-in user to make a PPTP
VPN connection through the Internet. You should set
the User Name and Password of remote dial-in user
below.
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Vigor2850 Series User's Guide