2.2 System Configuration—Software
Feature Guide 237
3.2. External Call Block
If multiple tenants are using the PBX, the External Call Block feature should be programmed to
control which COS numbers are allowed to access which CO line groups. By preventing certain
COS numbers from accessing certain CO line groups, each tenant can be given its own CO line
groups which no other tenant can access.
[Programming Example: External Call Block]
In this example:
External Call Block is employed to prevent tenants from accessing all CO line groups except the
ones designated to them. Each extension in a tenant is assigned a COS that is not assigned to
extensions which belong to another tenant.
a) Extensions in Tenant 1 are either COS 1 or 2. They can access CO line groups 1 and 2.
b) Extensions in Tenant 2 are either COS 3 or 4. They can access CO line groups 3 and 4.
c) Extensions in Tenant 3 are either COS 5 or 6. They can access CO line groups 5 and 6.
Conditions
• The following features used by incoming call distribution (ICD) group are determined by the tenant
number assigned to them (→ 1.2.2.1 Incoming Call Distribution (ICD) Group Features—OVERVIEW):
COS
CO Line
Group 1
CO Line
Group 2
CO Line
Group 3
CO Line
Group 4
CO Line
Group 5
CO Line
Group 6
COS 1
COS 2
COS 3
COS 4
COS 5
COS 6
Block
Block
Block
Block
Block
Block
Block
Block
Block
Block
Block
Block
Block
Block
Block
Block
Block
Block
Block
Block
Block
Block
Block
Block
CO Line
Group 1
CO Line
Group 2
CO Line
Group 3
CO Line
Group 4
CO Line
Group 5
CO Line
Group 6
COS 1 COS 2
Extension Group 1
Tenant 1
Extn. 100 Extn. 101
Extension Group 2
Extn. 103Extn. 102
COS 4COS 3
Extension Group 3
Tenant 2
Extn. 104 Extn. 105
Extension Group 4
Extn. 107Extn. 106
COS 5 COS 6
Extension Group 5
Tenant 3
Extn. 108 Extn. 109
Extension Group 6
Extn. 111Extn. 110
PBX
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