Your Extension’s Accessories
MD Evolution – Dialog 4425 IP Vision12
Your Extension’s Accessories
You may also add the following optional accessories to your 
extension:
• One or several DBY 419 01 satellite(s) or add-on key panel(s).
From one (1) to four (4) satellite(s) may be equipped, each one 
offering 17 repertory keys that may be programmed with your 
most often used internal or external telephone numbers or 
telephone service codes.
• A DBY 420 01 add-on interface module.
As the case may dictate, this module may enable you to 
connect to yours set, either an external ring device, or an 
external device visually indicating your extension’s free, ringing, 
or busy status.
This accessory is generally for alarm or security extensions.
• A headset.
This can allow you to process your calls using a headset, rather 
than in handsfree or handset mode.
This is especially useful for ICD group agents who process 
phone calls all day long.
This section provides you with all of the instructions necessary for 
installing these accessories. It also includes the instructions for 
using a headset.
For the programming and use of the add-on key panels’ or 
satellites’ repertory keys, see the “Physical Programming of Your 
Extension”, “Operations for Outgoing Calls” and “Group Services” 
sections.
Note: You may add up to 4 satellites on your extension 
without requiring any additional power supply units. All of 
the satellites are powered from your extension, which is 
powered either from the mains or the LAN.