# Shared Line Appearance

Shared Line Apprearance(SLA) also known in older phone systems as a
\"Key System\".

## FusionPBX Settings

FusionPBX Menu Advanced \> SIP Profiles \> edit a profile to enable SLA.

![image](../_static/images/additional_information/fusionpbx_multiple_reg_true.jpg)

-   **name:** multiple-registrations
-   **value:** contact
-   **enabled:** true

## Yealink SLA

FusionPBX Menu Accounts \> Device \> Edit a specific device.

![image](../_static/images/additional_information/fusionpbx_shared_line_yealink.jpg)

-   Line \> Shared Line
-   Options: 0-Disabled (default), 1-Broadsoft SCA, 2-BLA

## Polycom SLA

FusionPBX Menu Accounts \> Device \> Edit a specific device.

![image](../_static/images/additional_information/fusionpbx_polycom_shared_line.jpg)

-   Line \> Shared Line
-   Options: shared, private