BusinessPhone Communication Platform 5.1
Facilities

## ISDN SS Connected Line Identification Restriction (COLR)

## Definition

The supplementary service COLR enables the connected party to prevent presentation of its ISDN number.

## Use

This feature is used to restrict the presentation of the number of the actual connected B-party at the A-party, when call diversion is activated or the call is picked-up by another extension.

## Operation

### System telephones

There are two alternatives to restrict the presentation of the B-number at the A-party, at incoming calls:

##### Permanent mode

Command 0149 number secrecy = YES

The extension is configured to always restrict the presentation of the B-number at the A-party. With the connected message the BTU-D / BTU-B_ / MFU informs the network that the presentation of B-number has to be restricted at the A party.

##### Temporary mode

Command 0149 number secrecy = NO

A “number secrecy” key can be programmed at system telephones, and the user himself/herself may decide whether or not to restrict the presenatation of the B- number at the A-party. This key is also used for the CLIR function.

For the B-number restriction at the A-party, the key “number secrecy” has to be activated before call connection.

LED-status of the key “number secrecy“:

- Extinguished = B-number is presented at the A‑party.
- Steady light = B-number is restricted at the A‑party

Note

No matter of which mode - temporary or permanent - is activated, it will always have an effect on a subscribed CLIR function (see ISDN SS Calling Line Identification Restriction (CLIR)).

### ISDN terminals

It is defined by programming whether or not ISDN terminals on the S-interface are allowed to use the CLIR/CORL function.

It depends on the terminal type used, how the COLR function will be activated (see User’s Guide).

## Capacity / Limitation

If permanent mode is activated (command 0149 Number secrecy = YES), the key “number secrecy“ has no function and the lamp lights.

## Programming

### System telephones

0101 |  | Assign facility category

3050 |  | Program number secrecy?

0301 |  | Program Function key

0149 |  | Number Secrecy

### ISDN terminals

1957 |  | Number restriction allowed from TEs?

## Equipment

BTU-D with ISDN prom set or BTU-B_ or MFU.

Revision: K © Ericsson Enterprise 2003