3 Connected Line Identification Presentation (COLP)

04.813GPPLine Identification supplementary servicesStage 3TS

3.1 Normal operation

The connected line identity consists of a connected number and optionally, a connected subaddress.

The connected number is made up of a number of information units as indicated in GSM 04.08.

In addition to or instead of the connected number digits, the subscriber may be given the following information:

– screening indicator;

– presentation indicator.

Indicator values are given in GSM 04.08.

In the call set-up phase the calling mobile subscriber receives the information at the end of the call set-up.

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

A calling mobile subscriber subscribing to connected line identification presentation receives a message with the information indicated above, see figure 3.1.

MSa Network

CONNECT

<————————————————————————————————————————

Connectednumber (Screening-indicator, Presentation-indicator, Connected number digits),

Connected subaddress

NOTE: The connected subaddress is passed to MSa if it is received from the terminating network.

Figure 3.1: Notification by the network to the calling mobile subscriber

When the connected line identity is not available (due to interworking or presentation restrictions), appropriate indication information is given to the calling mobile subscriber.

3.2 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

————————————————————————————————————————>

Facility (Invoke = InterrogateSS (COLP))

RELEASE COMPLETE

<————————————————————————————————————————

Facility (Return Result = Interrogate SS (SS-status))

RELEASE COMPLETE

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

Facility (Return Error (Error))

RELEASE COMPLETE

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

Facility (Reject (Invoke_problem))

Figure 3.2: Interrogation of connected line identification presentation

3.3 Activation, deactivation, registration and erasure

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