# Connected line identification restriction (COLR)

The COLR service is used with the COLP service. The COLR service blocks called party address information from being presented to the calling user.

This service is available under many variants, including Q.SIG.

The COLR service can be provided in either permanent or temporary mode:

- Permanent mode: Usually provided to the called user on a subscription basis. Prevents the called user's address information from being presented to calling users.

- Temporary mode: May be provided to the called user on a subscription basis or may be generally available. Allows the called user to decide, on a call-by-call basis, whether to allow the calling user access to the called party address information. When subscribing, the user can specify a default behavior:

Default behavior | Description
Presentation restricted | By default, the network blocks the called user's address information from the calling user.
Presentation not restricted | By default, the network allows the called user's address information to be presented to the calling user.

The called user can override either default on a call-by-call basis.

If the called user has subscribed to COLR in temporary mode, the application determines if the calling user can access the address information by setting the Acu_conn_rs_connected_nb_pres macro in the ACU_CONN_RS message. If the called user sets Acu_conn_rs_connected_nb_pres to N_PRES_ALLOWED, the calling user can access this information. If the called user sets Acu_conn_rs_connected_nb_pres to N_PRES_RESTRICTED, the information is denied the calling user. In this case, called line information is not included in the ACU_CONN_CO primitive.

Note: A subscription option exists that causes presentation restricted to be overridden.

## COLR and other services

This section describes the interaction between the COLR service and other supplementary services.

### Notify diversion

If a forwarded-to or deflected-to user subscribes to COLR permanent mode, the user's number is not provided with the diversion notification.

If a forwarded-to or deflected-to user subscribes to COLR temporary mode, the user's number is not provided until negotiations with the user have taken place and a positive indication from the user has been received (the default value will not be used). The user's number can still be released on answer after confirmation, or the default can be used.

In either situation, a calling user who subscribes to COLP and has override capability does not receive the forwarded-to or deflected-to user's number as part of the notify diversion message, but can use the override capability to receive COLP information when the call is answered.

### Explicit call transfer

The connected user's restriction requirement from the original call is used to restrict the presentation of that user's address information to the transferred-to user.