This type of phone cannot be used for the administration functions covered by this document. However using centralized administration from another phone, functions can be applied to the phone from another extension.

The programmable buttons are numbered from 01 upwards from left to right.

1603 telephone buttons

Button Numbering




For systems running in key system mode, the first two programmable buttons, 01 and 02, are fixed as Intercom 1 and Intercom 2 buttons.

For systems running in PBX system mode, the first three buttons, 01 to 03, are fixed as call appearance buttons.