1.1 Incoming Call Features
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]
Caller
COS 1
COS 2
COS 3
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 2
Extn. 102
Extn. 103
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)
26
Feature Guide
Called Party
COS 1
COS 2
Block
Block
Block
COS 1
Extn. 100
Extn. 101
Extn. 104
COS 3
COS...
Block
Block
Block
COS 3
Extn. 105
Extn. 106