Instruction manual

Security measures
Issue 9 May 2003
5-49
Use world class routing restrictions
For Communication Manager, MultiVantage™ Software, DEFINITY ECS and
DEFINITY G2.2 and G3, use the following steps to restrict WCR from
unauthorized use.
For Communication Manager, MultiVantage™ Software, DEFINITY ECS and
DEFINITY G3:
■ Miscellaneous restrictions (COR-to-COR restrictions) are not observed
during AAR/ARS call processing. The FRL value is used instead.
■ Use change COR to display the Class of Restriction screen.
■ Assign the lowest possible FRL to the barrier code, authorization code,
VDN, station, or inbound trunk group. Use
change trunk-group to assign
the COR to all incoming trunks.
■ Use tandem tie trunks for routing private network calls.
■ Use change toll to display the Toll screen. Identify what calls are allowed
or disallowed.
■ Use change ars analysis to display the ARS Toll Analysis screen. Limit
long distance and international calls permitted by ARS trunks.
■ Use change route-pattern to assign the appropriate FRL for public
network trunks in the routing pattern.
■ Use change ars analysis to administer ARS Analysis Tables with at least
3- or 4-digit strings.
■ Use change ars analysis to distinguish between 7- and 10-digit calls. Use
the prefix digit instead of the
Min/Max fields for long distance calls.
■ Use wildcard characters with care.
■ Prevent calls by not administering their numbers on the ARS Toll Analysis
screen. If the originating endpoint is assigned a toll-restricted COR, this
prevents TAC toll calls.
NOTE:
Whenever possible, TAC calls should be disallowed. See ‘‘Disable
direct access to trunks’’ on page 5-39.
For DEFINITY G2.2:
■ Do not turn on overlapped sending (default is off in G2.2, on in earlier
releases). To turn off overlapped sending, enter
PROC103 WORD1
FIELD14.
Overlapped sending bypasses digit checking.
■ To force waiting for a TCM, the trunk group must be an intermachine trunk
group (
PROC103 WORD1 FIELD3=1 or 2) and ETN software must be
activated. A TCM will not be sent over an access tie trunk group no matter
how low the FRL is in
F2. However, a low FRL may be used to limit the
calling from the tie line, or to force a prompt for an authorization code.