5.1 System Configuration—System5.1.1 Class of Service (COS)DescriptionEach extension must belong to a Class of Service (COS). By assigning certain extensions to a COS, it ispossible to control the behaviour and privileges of extension users (allowing or denying certain extensionsaccess to various features, extensions, and trunks) depending on the duties appointed to them.Many extensions can belong to the same COS by assigning each extension the same COS number, allowingthe same restrictions and privileges to apply to a group of extensions.The following features are controlled on a COS basis:a. ® 2.1.2.2 Internal Call Blockb. ® 2.3.2 Call Forwarding (FWD)c. ® 2.3.3 Do Not Disturb (DND)—DND Overrided. ® 2.4.3 Call Pickupe. ® 2.5.4.3 Account Code Entryf. ® 2.5.5.3 Trunk Accessg. ® 2.10.2 Executive Busy Overrideh. ® 2.10.3 Call Monitori. ® 2.10.4.3 Off-hook Call Announcement (OHCA)j. ® 2.10.4.4 Whisper OHCAk. ® 2.7.1 Toll Restriction (TRS)/Call Barring (Barring)l. ® 2.7.3 Extension Dial Lockm. ® 2.7.5 Walking COSn. ® 2.11.8 Trunk Call Limitationo. ® 2.12.1 Call Transferp. ® 2.18.2 Door Openq. ® 2.16.1 Direct Inward System Access (DISA)r. ® 4.1.2.4 Call Forwarding (CF)—by ISDN (P-MP)s. ® 5.2.4.5 Wireless XDP Parallel Modet. ® 2.22.1.1 Station Message Detail Recording (SMDR)—SMDR for Outgoing Trunk Callsu. ® 5.1.4 Time Service—Time Service Switchingv. ® 5.1.6 Manager Featuresw. ® 5.5.3 PT Programmingx. ® 2.9.1 Primary Directory Number (PDN)/Secondary Directory Number (SDN) Extension—SDN Keymode, SDN Walking COS, and assigning SDN buttons through PT programmingCOS for Unified MessagingThe Unified Messaging system has its own COS settings for controlling access to various functions.(® 3.2.1.11 Class of Service (COS))Conditions• Walking COSExtension users can temporarily use their own COS at another extension with a less-privileged COS toaccess features, extensions, or trunks that are normally inaccessible due to that extension’s COS.466 Feature Guide5.1.1 Class of Service (COS)
