30 Getting Started5.2.2 Toll Restriction (TRS) FeaturesToll Restriction (TRS) can prohibit certain extension users from making unauthorised outside (CO)line calls. Every extension is assigned to one of 5 classes of service (COSs) for each time servicemode (TRS-COS—Day/Night/Lunch [601-603]); COS 1 grants the highest level of authorisation,allowing all outside (CO) line calls to be made, and COS 5 grants the lowest level of authorisation.COSs 2 through 5 are used to restrict calls with a combination of preprogrammed Denied Code Table(→ TRS—COS 2-5 Denied Code [302-305]) and Exception Code Table (→ TRS—Exception Code[306]).Applicable tables by COSThe Denied Code Tables and Exception Code Tables that apply to each COS are listed below.TRS-COS—Day/Night/Lunch [601-603]COS No. Denied Code Tables Exception Code Tables1 No restriction.(Not Programmable)No restriction.(Not Programmable)220 denied codes programmed in [302].(Table for Class 2)80 exception codes (code numbers 01–80) programmed in [306].(Tables for Classes 2 through 5)340 denied codes programmed in [302]and [303].(Tables for Classes 2 and 3)60 exceptions codes (code numbers 01–60) programmed in [306].(Tables for Classes 3 through 5 )460 denied codes programmed in [302]through [304].(Tables for Classes 2 through 4)40 exception codes (code numbers 01–40) programmed in [306].(Tables for Classes 4 and 5)580 denied codes programmed in [302]through [305].(Tables for Classes 2 through 5)20 exception codes (code numbers 01–20) programmed in [306].(Table for Class 5)6 X NEXT extension jack no. COS no. STORE END(1… 5)(01…08/ )To continueTo continueSELECTNEXT PREVor(01…03)01: for day02: for night03: for lunch