Operation Manual

Access Time Restrictions
NT/MPRI – 4 Special NT/MPRI Settings 72
Incoming call handling when cost allocation is set to
“Local Site”
4.5 Access Time Restrictions
To regulate LAN access by time of day and day of the week, time pro-
files can be defined using the menu command “Special”. The restric-
tions defined here then can be assigned to individual call destinations
in the call destination settings. For example, a time profile that permits
access only on weekdays during business hours can be assigned to all
branch offices. Access outside the specified times is then denied.
4.6 Data Encryption
The NT/MPRI allows data encryption to protect data packets from unau-
thorized access during transmission.
Incoming call
accepted after
poss. authentication
ISDN
D channel
Connection request
D and B channels
Data exchanged
in both directions
ISDN connection
cleared down
after inactivity
D and B channels
Data exchanged
in both directions
Local Site
NT/MPRI)
Request rejected,
call-back (call is therefore
charged to local site)
Data packet
(such as e-mail)
for the remote site
Caller
(call destination)
identified by CLI
D and B channels
Remote Site
(NT/MPRI)
Data packet for
the remote
network
Incoming call
accepted after
poss. authentication
D and B channels
ntmpri-e.book Seite 72 Donnerstag, 28. Februar 2002 11:26 11