In this example:a. COS 1 can make calls to all extensions.b. COS 2 can make calls to COS 1 only. (COS 2 cannot make calls to COS 2.)c. COS 3 can make calls to COS 3 only.COS 1Extn. 100 Extn. 101COS 2Extn. 102 Extn. 103COS 3Extn. 104 Extn. 105 Extn. 106Conditions• Internal Call Block also prohibits certain features, such as Walking Extension and Walking COS, from beingperformed between certain extensions.• Any extension can make an Operator Call regardless of the Internal Call Block setting of its COS. (®12.1.5 Operator Features)• Because each doorphone port is assigned a COS, the Internal Call Block feature can restrict certainextensions from calling certain doorphones. (® 4.1.12 Doorphone Call)PC Programming Manual References4.14 [2-7-3] Class of Service—Internal Call Block— COS Number of the Extension Which Receive the Callfrom Other Extension 1–645.12 [3-5-1] Incoming Call Distribution Group—Group Settings—Main— COS6.1 [4-1-1] Wired Extension—Extension Settings—Main— COS6.10 [4-2-1] Portable Station—Extension Settings—Main— COS7.1 [5-1] Doorphone— COS7.6 [5-4] External Relay— COS NumberFeature Manual References3.1.21 COS (Class of Service)9.1.15 IP-PT (IP Proprietary Telephone)DescriptionThis PBX supports the connection of IP proprietary telephones (IP-PTs), which function almost identically tonormal PTs. However, they connect to the PBX over a Local Area Network (LAN), and send and receive callsusing Internet Protocol (IP).Document Version 2009-12 Feature Manual 1659.1.15 IP-PT (IP Proprietary Telephone)
