2 Calling Line Identification Restriction (CLIR)

22.0813GPPLine Identification supplementary servicesStage 1TS

2.1 Definition

The CLIR Supplementary Service enables the calling party to prevent presentation of its line identity to the called party.

2.2 Description

2.2.1 Description

The CLIR Supplementary Service is a Supplementary Service offered to the calling party to prevent presentation of the calling party’s line identity, to the called party. In the case where the called party has an override category, see subclause 2.4.

2.2.2 Applicability to telecommunications services

The applicability of this Supplementary Service is defined in 3GPP TS 22.004.

2.3 Normal procedures with successful outcome

2.3.1 Provision

This Supplementary Service is provisioned for all Basic Services subscribed to and to which it is applicable, i.e. not provisioned for any subset of these Basic Services.

As a service provider option, the CLIR Supplementary Service can be offered with one subscription option permanent (invoked for all relevant calls) or temporary (suppressed by the user on a per call basis).

In temporary mode, the subscriber may subscribe to the default values:

– presentation restricted: or,

– presentation not restricted.

The option applies to all BS which are provisioned for this SS.

2.3.2 Withdrawal

This Supplementary Service will be withdrawn at the subscriber’s request or for administrative reasons.

2.3.5 Activation

The CLIR Supplementary Service shall be activated on provision.

2.3.6 Deactivation

The CLIR Supplementary Service shall be deactivated on withdrawal.

2.3.7 Invocation

If subscribed to in the permanent mode, then the network shall automatically invoke the CLIR Supplementary Service for each outgoing call.

If subscribed-to in the temporary mode with the default value "presentation restricted", then the network shall automatically invoke the CLIR Supplementary Service for each outgoing call unless CLIR is suppressed by subscriber request at the time of call request.

If subscribed-to in the temporary mode with the default value "presentation not restricted", then the network shall only invoke the CLIR Supplementary Service if requested by subscriber at the time of call request.

2.3.8 Normal operation with successful outcome

When the CLIR Supplementary Service is invoked, the originating network shall provide the destination network with a notification that the line identity of the calling party is not allowed to be presented to the called party. The originating network may also provide information on the cause of no CLI.

If the called party subscribes to the CLIP Supplementary Service and the CLIR Supplementary Service has been invoked, then the called party shall receive an indication that the calling line identity is not available due to restriction.

2.3.11 Interrogation

Data request

The mobile subscriber can request the data of the Supplementary Service.

In response the following information shall be given:

– whether the service is provided of not;

– if provided which mode is subscribed;

– if subscribed-to the temporary mode, which default value.

2.4 Exceptional procedures or unsuccessful outcome

If the subscriber has subscribed to the permanent mode and she tries to suppress the invocation of the CLIR Supplementary Service per MMI command during call set-up (i.e. requests that the CLI is displayed), she shall be notified that the suppression has not been performed and the call set-up shall continue. If the user has not subscribed to CLIR Supplementary Service and she tries to invoke it during call set-up per MMI command (i.e. requests that the CLI is not displayed), the call set-up attempt shall be rejected.

If the called party has a relevant override category (see subclause 1.3.1), the restriction service will be overridden and the calling line identity will be presented to the called party.

2.5 Alternate Procedures

A VPLMN which supports the CLIR service shall ensure that the line identity of a subscriber whose HPLMN does not support the CLIR service shall not be displayed to the called party unless the subscriber wishes so or the called party has CLIR override capability.

2.6 Interactions with other Supplementary Services

2.6.81.1 Calling line identification presentation

See subclause 1.6.81.2.

2.6.82.1 Call forwarding unconditional

No interaction, i.e. when the CLIR Supplementary Service is applicable and invoked for the original calling subscriber, her line identity shall not be presented to the forwarded-to user unless the forwarded-to user has an override category.

2.6.82.2 Call forwarding on mobile subscriber busy

Same as the interaction with call forwarding unconditional.

2.6.82.3 Call forwarding on no reply

Same as the interaction with call forwarding unconditional.

2.6.82.4 Call forwarding on mobile subscriber not reachable

Same as the interaction with call forwarding unconditional.

2.7 Interworking considerations

On calls to or via non-ISDNs, it cannot be assured that a calling line identification restriction indication can be carried to the destination network. As a national option the originating network can restrict any information identifying the calling party from being forwarded to the destination network when the CLIR Supplementary Service is applicable. If a destination network receives a calling line identity without any indication of presentation allowed or restricted, the destination network shall act according to its rules and regulations.

For inter-network calls, when the CLIR Supplementary Service is invoked, the originating network shall provide the destination network with a notification that the line identity of the calling party is not allowed to be presented to the called party. The originating network may also provide information on the cause of no CLI.

NOTE: When the Supplementary Service CLIR is invoked, some network providers may not send the identity of the calling subscriber to other network.