c. COS 3 can make calls to COS 3 only.
COS 1
Extn. 100 Extn. 101
COS 2
Extn. 102 Extn. 103
COS 3
Extn. 104 Extn. 105 Extn. 106
Conditions
• Internal
Call Block also prohibits certain features, such as Walking Extension and Walking COS, from being
performed between certain extensions.
• Any extension can make an Operator Call regardless of the Internal Call Block setting of its COS. (®
14.1.9 Operator Features)
• Because each doorphone port is assigned a COS, the Internal Call Block feature can restrict certain
extensions from calling certain doorphones. (® 5.1.15 Doorphone Call)
PC Programming Manual References
10.7.3 PBX Configuration—[2-7-3] System—Class of Service—Internal Call Block—
COS Number of the
Extension Which Receive the Call from Other Extension 1–512
11.5.1 PBX Configuration—[3-5-1] Group—Incoming Call Distribution Group—Group Settings—Main—
COS
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
13.1 PBX Configuration—[5-1] Optional Device—Doorphone— COS
13.4 PBX Configuration—[5-4] Optional Device—External Relay— COS Number
Feature Manual References
4.1.22 COS (Class of Service)
Document Version 2016-03 Feature Manual 209
10.1.15 Internal Call Block
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