Administrator's Guide

Facility restriction levels and traveling class marks
Issue 5 October 2002 1685555-233-506
Detailed Description
FRL
The switch compares the FRL of the outgoing phone to the FRL of either the
terminating trunk group or, for AAR and ARS, the routing preference specified on
the Routing Pattern Table. If the FRL of the originator is equal to or greater than
the terminating or route pattern FRL, the call continues. Otherwise, the call is
blocked.
TCM
If an intertandem tie-trunk group is used for a call, then a TCM is outpulsed as the
last digit. If the intertandem tie-trunk FRL is equal to or greater than the
terminating FRL, the call continues. If the originating FRL is less than the
terminating FRL, the TCM is compared with the tie-trunk’s FRL. If the TCM is
greater than or equal to the FRL, the call continues.
Call-originating facilities
Any of the following can originate an AAR or ARS call. Each is assigned an FRL
via an associated COR.
■ attendant
■ data terminal capable of keyboard dialing
■ incoming tie-trunk group from a subtending location
■ incoming intertandem tie-trunk group (at a tandem switch)
■ incoming access tie-trunk group (links a remote main switch to a tandem
switch)
■ phone
■ remote access user
Phones and all incoming tie-trunk groups use the FRL of their COR. On
attendant-extended calls, the attendant-group FRL is used. If Individual Attendant
Access assigned, the individual attendant’s COR FRL is used. Data terminals use
the FRL of the COR assigned to the associated data module.
A remote access call uses the FRL of the COR assigned to the dialed barrier code.
If a barrier code is not required on remote access calls, there is no FRL.