Administrator's Guide

Class of restriction
Issue 5 October 2002 1645555-233-506
■ Class of Service (COS)
In some cases, the COR can be overridden by the COS. See the Trk-to-Trk
Restriction Override field documented with the ‘‘Class of Service’’ on
page 672.
■ Controlled Restriction
Restrictions assigned via Controlled Restriction override COR restriction.
■ Emergency Access to Attendant
Emergency Access to Attendant calls are not restricted by COR.
Interactions for called-party and calling-party restrictions
■ Night Service
Night Service and Night Station — Trunk Answer From Any Station
override Inward, Manual Terminating Line, and Public Restrictions.
■ Tie-Trunk Access
Incoming dial-repeating tie-trunk calls can be completed directly to an
inward-restricted or public-restricted extension but cannot be extended by
an attendant to an inward-restricted telephone.
■ Transfer
Incoming trunk calls cannot be transferred to an inward-restricted
extension when a 3-way COR check is made.
Incoming trunk calls can be transferred from an unrestricted extension to
an inward-restricted or public-restricted extension if the 3-way COR check
on Conference is overridden.
Interactions for fully restricted service restrictions
■ Centralized Attendant Service (CAS)
Since COR information is not passed over Release Link Trunks (RLT),
fully restricted service allows all CAS calls. Therefore, CAS allows a
public network call to complete to a fully-restricted station.
■ Distributed Communications System (DCS)
Fully Restricted Service allows all DCS calls because COR information is
not transparent for DCS. DCS can allow a public network call to be
completed to a Fully Restricted station.
■ Power Failure Transfer
All authorization features are bypassed when the switch is in Emergency
Transfer Mode.