Instruction manual

Security measures
Issue 9 May 2003
5-45
Disallow outgoing calls from tie trunks
If your tie trunks are used solely for office-to-office calling, you can deny access
from tie trunks to outgoing AAR/ARS/WCR trunks. This does not affect calls using
TACs. For Communication Manager, MultiVantage™ Software, DEFINITY ECS,
DEFINITY G1, G3, and System 75:
■ Use change cor to create a new Class of Restriction for the incoming tie
line trunk group.
■ Assign the lowest possible FRL that provides private network calls to
tandem tie trunks.
■ Assign COR-to-COR restrictions that give incoming tie lines no direct
access calling permissions to CORs of trunk groups that are not
dial-access restricted.
■ Use change trunk-group to assign the COR to the tie line trunk group.
For G2 and System 85:
■ Use PROC103 WORD1 FIELD5=0 to deny access to AAR/ARS/WCR
trunks from tie trunks [other than Electronic Tandem Network (ETN)
trunks]. However, the calls coming in on an access tie line will not be able
to access AAR to dial other network numbers, including extensions that
terminate in this PBX. A recommended alternative is to assign a low FRL
on the access tie line group in
PROC103 WORD1 FIELD2.
Limit access to tie trunks
If you need to make AAR/ARS/WCR calls using tie trunks, you can limit access to
the trunks using the following procedures.
For Communication Manager, MultiVantage™ Software, DEFINITY ECS,
DEFINITY G1, G3, and System 75:
■ Use change cor to display the Class of Restriction screen.
■ Assign a higher FRL to provide the calling range required.
■ Use change station or change trunk-group to assign the COR to the
originating stations or trunks.
■ Assign COR-to-COR restrictions that give no calling permissions to other
trunk group CORs.