Operating Manual References1.3.66 Time Service2.1.6 Time Service Mode Control17.1.6 TRS (Toll Restriction)DescriptionToll Restriction (TRS) can prohibit extension users from making certain CO line calls, based on the Class ofService (COS) assigned to them.® 6.1 [4-1-1] Wired Extension—Extension Settings—Main— COS® 6.10 [4-2-1] Portable Station—Extension Settings—Main— COS® [602] Class of ServiceEach COS is assigned a TRS level for each time mode; level 1 grants the highest level of authorization, allowingall CO line calls to be made, and level 7 grants the lowest level of authorization, prohibiting all CO line callsfrom being made. TRS levels 2 through 6 are used to restrict calls by combining preprogrammed Denied andException Code Tables, explained below.Each COS can also have a separate TRS level applicable to calls made using System Speed Dialing.A TRS check is applied each time a dialed number is sent to a CO line after an extension user goes off-hookand seizes a line.326 Feature Manual Document Version 2009-1217.1.6 TRS (Toll Restriction)