Technical information

Large Business Communications Systems
4-16 Issue 7 June 2001
Class of Service
For DEFINITY G2 and System 85, station access to various switch features is
controlled by options in the Class of Service (COS) associated with the extension
number. The following COS options are related to toll fraud prevention:
 Call Forward Off-Net: allows a user to call forward outside the switch to
non-toll locations (G2.1). In G2.2, the user may be allowed to forward to a
toll location (including international destinations), depending on the
permissions and restrictions for that extension, as defined in PROC000,
WORD3, FIELD7.
 Call Forward Follow Me: allows a user to forward calls outside the switch
when other options are set.
 Miscellaneous Trunk Restrictions: restricts certain stations from calling
certain trunk groups via dial access codes.
 APLT Off-Net: allows callers to dial public network numbers over the
EPSCS private network.
 Terminal-to-Terminal Restriction: restricts the user from placing or receiving
any calls except to and from other stations on the switch.
 Outward Restriction: restricts the user from placing calls over the CO, FX,
or WATS trunks using dial access codes to trunks. Outward restriction also
restricts the user from placing calls via ARS/WCR. Use ARS/WCR with
WCR toll restrictions instead.
 Toll Restriction: prevents users from placing toll calls over CO, FX, or
WATS trunks using dial access codes to trunks. Use ARS/WCR with WCR
toll restrictions instead.
 ARS/WCR Toll Restriction: restricts users from dialing the ARS or WCR
Network I Toll Access Code or from completing a toll call over ARS/WCR.
 FRL: establishes the user’s access to AAR/ARS/WCR routes.
 CDR Account Code: requires the entry of an account code before an
ARS/WCR call is processed or before completing a TAC call to a toll
destination.
NOTE:
Account code entries are not validated.
For DEFINITY ECS, DEFINITY G1, G3, and System 75, COS identifies the calling
features available to a station, such as auto callback and priority calling. It also
provides for the assignment of console permissions; these should be assigned
sparingly, and only to terminals that require them. It is especially important that
console permissions not be assigned to Remote Access extensions.