Technical information

Large Business Communications Systems
4-44 Issue 7 June 2001
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 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 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.
For DEFINITY G2 and System 85:
 When DACs are available to users, enter PROC110 to provide
Trunk-to-Trunk restrictions.
 Force the entry of an authorization code with PROC103 WORD1 FIELD6.
NOTE:
The caller is not prompted for an authorization code on incoming tie
trunk calls with a TCM.