1 Calling Line Identification Presentation (CLIP)

22.0813GPPLine Identification supplementary servicesStage 1TS

1.1 Definition

The CLIP Supplementary Service provides the called party with the possibility to receive the line identity of the calling party.

1.2 Description

1.2.1 Description

This Supplementary Service provides for the ability to indicate the line identity of the calling party to the called party.

The network shall deliver the calling line identity to the called party at call set-up time, regardless of the terminal capability to handle the information.

1.2.2 Applicability to telecommunication services

The applicability of this Supplementary Service is defined in 3GPP TS 22.004 [2].

1.3 Normal procedures with successful outcome

1.3.1 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.

Override category within a PLMN

Override category within an ISDN/PLMN. Depending on national regulations, some networks may define categories of subscribers that have the ability to override the presentation restriction (CLIR, clause 2) and have the calling line identity presented (e.g., the police). The ability to have such override category is a national option.

Override category between a PLMN and a network providing calling line identification restriction

Override category between ISDN/PLMNs. When a call originates in one ISDN/PLMN and terminates in another ISDN/PLMN and the CLIR Supplementary Service is applied, the rules and regulations of the destination network shall apply. For example, the override category may not be applicable in the originating network but may be applicable in the destination network. In this situation, a call with the CLIR Supplementary Service applied can still be overridden in the destination network.

The override category is only applicable within the HPLMN country.

1.3.2 Withdrawal

The CLIP Supplementary Service shall be withdrawn at the customer’s request or for administrative reasons.

1.3.5 Activation

The CLIP Supplementary Service is activated as a result of provision.

1.3.6 Deactivation

The CLIP Supplementary Service is deactivated as a result of withdrawal.

1.3.7 Invocation

The network shall automatically invoke the CLIP Supplementary Service in the call set-up phase.

1.3.8 Normal operation with successful outcome

A user who has subscribed to the CLIP Supplementary Service and receives a call shall also receive the line identity of the calling party.

Note: The decision of whether the user-defined name stored in the handset should take precedence over the line identity of the calling party is a handset implementation issue. However for user experience it may be preferable to display the user-defined name available. In case there are several names associated with the number it is up to the handset implementation to choose which name to display.

In addition to or instead of the calling line identity, the subscriber may be given a Presentation Indicator and/or a Screening Indicator with the relevant information. If provided by the network, the subscriber may also be given some additional information on the Cause of no CLI in case of a presentation restricted.

1.3.11 Interrogation

Status check

The mobile subscriber can request the status of the Supplementary Service and be informed if the service is provided to her.

1.4 Exceptional procedures or unsuccessful outcome

If the CLIR Supplementary Service is applicable to the call, then the called PLMN user shall receive an indication that the calling line identity is not available because of restriction.

NOTE: See also subclause 1.3.1 (override category).

In some interworking situations in which the connection is not completely supported by the sufficient signalling capability, then the called PLMN user shall receive an indication that the calling line identity is not available.

For an international call in which the originating network does not provide the calling line identity, then the called PLMN user shall receive an indication that the calling line identity is not available.

1.5 Alternate procedures

None identified.

1.6 Interactions with other Supplementary Services

1.6.81.2 Calling line identification restriction

The CLIR Supplementary Service shall take precedence over the CLIP Supplementary Service.

The CLIP Supplementary Service can take precedence over the CLIR Supplementary Service when the called user has an override category. The availability of the override category as well as the handling of calling line identity parameters for the override category is a national matter.

1.6.82.1 Call forwarding unconditional

When a call has been forwarded and the forwarded-to user has been provided with the CLIP Supplementary Service, the forwarded-to user shall receive the number of the original calling user, if this calling user has not subscribed to or invoked the CLIR Supplementary Service.

1.6.82.2 Call forwarding on mobile subscriber busy

Same as the interaction with call forwarding unconditional.

1.6.82.3 Call forwarding on no reply

Same as the interaction with call forwarding unconditional.

1.6.82.4 Call forwarding on mobile subscriber not reachable

Same as the interaction with call forwarding unconditional.

1.6.83.1 Call Waiting

If the served mobile subscriber is provisioned with the CLIP service, the notification of an incoming (waiting) call offered to that subscriber shall include the calling line identity, as for a normal call.

1.6.88.8 Anonymous Call Rejection

See 3GPP TS 22.088 [4].

1.7 Interworking considerations

According to national network specific rules, the CLIP Supplementary Services need not be applicable, if at least one of the two parties is not an ISDN or PLMN subscriber.