Class of Service

Class of Service
Class of Service (COS) sets various features and dialing options (called items) for extensions. The system allows any number of extensions to share the same Class of Service. An extension can have a different Class of Service for each of the Night Service modes. This lets you program a different set of dialing options for daytime operation, nighttime operation and even during lunch breaks. An extension Class of Service can be changed in system programming or via a Service Code (normally 677). There are 15 available Classes of Service.
Conditions
• Before assigning a new COS, make sure the new COS matches the old COS or you may enable options, which the extension should not have or remove options, which it should have.
• An extension can have a different Class of Service for each Service mode. At default, the Mode names are assigned as follows:
- Mode 1 = No setting
- Mode 2 = Night
- Mode 3 = Midnight
- Mode 4 = Rest
- Mode 5 = Day2
- Mode 6 = Night2
- Mode 7 = Midnight2
- Mode 8 = Rest2
• If a user dials a number not programmed in ARS, PRG 26-01-03 determines if the system should route over the trunk group settings defined in PRG 21-02 or play an error tone.
• When using ARS Class of Service, with PRG 26-01-03 set to (1) "Play Warning Tone", any trunk pointed or transferred to a virtual that is Call Forward Off-Premise will not complete. For a virtual to Call Forward Off-Premise, PRG 26-01-03 must be set to "Route to trunk group" and the call will follow the trunk group settings of the trunk, assigned in PRG 21-03.
• When using ARS Class of Service, with PRG 26-01-03 set to (1) "Play Warning Tone" or transferred to a virtual that is Call Forward Off-Premise will always follow ARS Class 1 routing properties.