Panasonic KX-TDA600

1.9 I
Feature Manual 163
1.9.14 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. (→
1.12.5 Operator Features)
• Because each doorphone port is assigned a COS, the Internal Call Block feature can restrict certain
extensions from calling certain doorphones. (→ 1.4.11 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