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Voice Feature Guide 01

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Connected Line Identification Presentation

Connected Line Identification Presentation

The connected line identification presentation (COLP) service enables the AG to determine whether to display the called party's identifier to the calling party based on the subscription data of a user during session setup and to process the call.

Connected Line Identification Presentation

This top describes the definition and benefits of the Connected Line Identification Presentation (COLP) service.

Definition
The COLP service determines whether to display the called party's identifier to the calling party based on the subscription data of the user and performs corresponding operations. The called line number presentation service can be classified into the following types:
  • COLP: a service on the originating side. When the called party is not subscribed to the COLR service, the called number is displayed on the calling party's terminal when the called party answers the call.
  • Connected Line Identification Restriction (COLR): a service on the terminating side. If the called party is subscribed to the COLR service, the called number is not displayed to the calling party even if the calling party has subscribed to the COLP service.
Benefit
Beneficiary Benefits

Carrier

The COLP service enriches users' service experience, enhances carriers' competitiveness, and provides value-added services for carriers.

User

The COLP service enables users to set the CLIP service by themselves and experience different services.
  • The called party can determine whether to display the called number to the calling party in the session connection phase.
  • The calling party can determine whether to display the called number in the session connection phase.
Standards Compliance

EN300 356

EN300 097

RFC4916

EN300 098

ETSI TS 183 036

ETSI TS 183 043

ETSI TS 300 097

ETSI TS 300 098

Service Flow of Connected Line Identification Presentation

This topic describes the connected line identification presentation (COLP) service flows for POTS and ISDN users.

COLP Service Flow for ISDN Users

Figure 1-81 shows the COLP service flow for ISDN users.

Figure 1-81 COLP service flow for ISDN users

User A is the calling party, and user B is the called party. The COLP service flow for ISDN users is as follows:
  1. User A initiates a call to user B.
  2. User B sends a 180 message to user A.
  3. User B sends a Connect message, which carries the ConnectedNumber information element, indicating the called number.
  4. AG2 maps the Connect message to a 200 response and sends it to the IMS. The 200 response carries the P-Prefered-Identify or From header field. After receiving the 200 message, the IMS maps the P-Prefered-Identify header field in the 200 message to the P-Asserted-Identify header field based on the COLP service permission of users A and B, and adds the Privacy header field to instruct AG1 whether to display the called number.
  5. The user A receives a Connect message from AG1 and displays the information based on the Privacy header field in the Connect message.
NOTE:
The COLP service flow of 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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