IC Knowledge Base

Calling Line ID Blocking

Calling Line ID Blocking


This feature enables a User to block delivery of his/her identity on all outgoing calls to a called party outside of their line. There are 2 types of blocking, ‘Persistently’ block or block on a per call basis.


Calling Line ID Blocking is used to block or allow the delivery of a User’s identity (both name and number), on an outgoing call to the called party.

When active, calls made by the User to external numbers have the presentation of their identity, both name and number blocked. The blocking is achieved by setting the presentation indicator associated with the calling party number to “private”, which prevents the User’s identity from being revealed to the called party’s device.

The use of Calling Line Identity Blocking Persistent will block the User’s Calling Line Identity for all outgoing external calls.

Calling Line ID Blocking Per Call

This feature overrides the persistent presentation of the active Calling Line ID (CLID) so Users can block the delivery of their identities for the next outgoing call only. At the end of the call, the presentation of the User’s identity is restored to its persistent active status.

The Users can block the delivery of their identities for the next call by dialling the Feature Access Code from their devices before making the call. This results in a confirmation tone followed by a dial tone. The Users can then make the outgoing call as usual and their identities are blocked.


Call Forwarding Not Reachable can be activated and deactivated by use of Feature Access Codes:


*67 or 141 Calling Line ID Delivery Blocking Per Call

*31 Calling Line ID Delivery Blocking Persistance Activation

#31 Calling Line ID Delivery Blocking Persistance Deactivation

*54* Calling Line ID Delivery Blocking Status

*65 Calling Line ID Delivery Per Call


Limiting Conditions

A User’s calling Line Identity cannot be blocked for calls to other User’s on your line.

When the Calling Line Identity is blocked, calls may be refused by the other party if they have features similar to ‘Anonymous Caller Rejection’ activated.


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