1.1 Incoming Call Features
26 Feature Guide
1.1.2.2 Internal Call Block
Description
Internal calls can be restricted based on the Class of Service (COS) assigned to the caller and to the called
party.
[Programming Example: Internal Call Block]
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.
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. (→
2.2.5 Operator Features)
• Because each doorphone port is assigned a COS, the Internal Call Block feature can restrict certain
extensions from calling certain doorphones. (→ 1.15.1 Doorphone Call)
Caller
COS 1
COS 2
COS 3
COS 1
Block
COS 2
Block
Block
COS...
Block
Block
COS 3
Block
Called Party
COS 1
Extn. 100 Extn. 101
COS 2
Extn. 102 Extn. 103
COS 3
Extn. 104 Extn. 105
Extn. 106
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