1 Calling Line Identification Presentation (CLIP)

04.813GPPLine Identification supplementary servicesStage 3TS

1.1 Normal operation

The calling line identity consists of a calling party BCD number and optionally, a calling party subaddress.

The calling party BCD number information element is made up of a number of information units as indicated in GSM 04.08.

In addition to or instead of the calling party’s digits, the subscriber may be given the following information:

– screening indicator;

– presentation indicator.

Indicator values are given in GSM 04.08.

The calling party subaddress information element is made up of a number of information units as indicated in GSM 04.08.

A called mobile subscriber subscribing to calling line identification presentation service receives the call with the information indicated above, see figure 1.1.

MSb Network

SETUP

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Calling party BCD number (screening indicator, presentation indicator, calling party digits),

Calling party subaddress

NOTE: The calling party subaddress is passed to MSb if it is received from the originating network.

Figure 1.1: Notification by the network to the called mobile subscriber

When the calling line identity is not available, the presentation indicator which is given to the called mobile subscriber takes the value of "number not available".

1.2 Interrogation

Status Check

The mobile subscriber can request the status of the supplementary service and be informed if the service is provided to him.

MSa Network

REGISTER

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Facility (Invoke = InterrogateSS (CLIP))

RELEASE COMPLETE

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Facility (Return Result = InterrogateSS (SS-Status))

RELEASE COMPLETE

<- – – – – – – – – – – – – – – – – – — – – – – – – – – – – – – – – – – – – – – – – – – – –

Facility (Return Error (Error))

RELEASE COMPLETE

<- – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –

Facility (Reject (Invoke_problem))

Figure 1.2: Interrogation of calling line identification presentation

1.3 Activation, deactivation, registration and erasure

Activation, deactivation, registration and erasure of the supplementary service calling line identification presentation are not applicable.