PC Programming Manual References
10.7.1  PBX Configuration—[2-7-1] System—Class of Service—COS Settings
12.1.1  PBX Configuration—[4-1-1] Extension—Wired Extension—Extension Settings—Main— COS
12.2.1  PBX Configuration—[4-2-1] Extension—Portable Station—Extension Settings—Main— COS
Feature Guide References
3.2.1  System Features
6.1  Capacity of System Resources
User Manual References
1.2.7  Calling without Restrictions
Feature Guide 421
5.1.1 Class of Service (COS)