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Voice Feature Guide 01

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Calling Line Identification Presentation

Calling Line Identification Presentation

The calling line identification presentation (CLIP) service enables the AG to determine whether to display the identity and name of the calling party to the called party based on the subscription data of a user during session setup.

Calling Line Identification Presentation

This topic describes the definition and benefits of the calling line identification presentation (CLIP) service.

Definition
The calling line number presentation service can be classified into the following types:
  • The CLIP service allows the calling number, name, and other information to be presented to the called party when the called party is alerted.
  • The calling line identification restriction (CLIR) service enables the calling party to restrict the presentation of the number, name, and multimedia information to the called party during call setup if the calling party has subscribed to the CLIR service and the called party has not subscribed to the RIO service.
  • The calling line identification restriction override (RIO) service is a callee-side service that allows the number of the calling party to be presented to the called party even if the calling party registers CLIR.
Benefit
Beneficiary Benefits

Carrier

The CLIP service enriches users' service experience, improves the network connection rate, and provides value-added services for carriers.

User

The CLIP service enables users to flexibly set the display type of the calling number to facilitate the selection of the terminal and the occasion for answering the calls and to avoid missing calls.

Implementation

The CLIP service does not require service logic and does not need to be configured on the device. After subscribing to the basic call service, voice users can subscribe to and use the CLIP service on the terminal.

Standards Compliance

ETSI EN 300 092-1

ETSI EN 300 093-1

RFC3323

ETSI TS 183 036

ETSI TS 183 043

Service Flow of Calling Line Identification Presentation

This topic describes the calling line identification presentation (CLIP) service flow for POTS and ISDN users, including CLIP, calling line identification restriction (CLIR), and calling line identification restriction override (RIO) service flows.

CLIP Service Flow for ISDN Users

Figure 1-80 shows the CLIP service flow for ISDN users.

Figure 1-80 CLIP service flow for ISDN users

The CLIP service flow for ISDN users is as follows (taking user A calling user B as an example):
  1. User A initiates a call. The Setup message contains the calling party number information element.
  2. AG1 identifies the calling party number information element in the Setup message and maps it to the P-Preferred-Identity or From header field.
  3. After receiving the Invite message, the IMS determines the service permission of user A and B, maps the service permission of users A and B to a corresponding message, and sends the message to AG2.
    • If user A has the CLIP service permission or user B has the RIO service permission, the IMS removes the P-Preferred-Identity header field from the message, adds the P-Asserted-Identity and Privacy header fields to the message, and keeps the From header unchanged. If the value of the Privacy header field is none, it indicates that the calling number information is displayed to the called party.
    • If user A has the CLIR service permission and B does not have the RIO service permission, the IMS removes the P-Preferred-Identity header field from the message, adds the P-Asserted-Identity and Privacy header fields to the message, keeps the From header field unchanged, and sets the value of the Privacy header field to id, header, or user, indicating that the calling number information is not displayed to the called party.
  4. AG2 determines whether the Setup message sent to user B carries the calling number information element based on the P-Asserted-Identity, From, and Privacy header fields in the message.
    • If the Privacy header field is set to none or does not exist, the Setup message sent from AG2 to user B carries the calling party number information element.
    • If the value of the Privacy header field to id, header, or user, the Setup message sent from AG2 to user B does not carry the calling party number information element.
NOTE:
The CLIP service flow for a POTS user is similar to that of an ISDN user.
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Updated: 2019-02-22

Document ID: EDOC1100067358

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