Option unit

Dialog 4223 Professional

The Option unit DBY 420 02 is an optional accessory, to be installed on the bottom of your telephone set. The following devices can be installed via the Option unit:

• Tape recorder
• Extra bell or busy indication outside your door
• USB connector

Dialog 3213

The Option unit DBY 410 02 is an optional accessory, to be installed on the bottom of your telephone set. The following devices can be installed via the Option unit:

• Tape recorder
• Extra bell or busy indication outside your door
• Enhanced Headset functionality
• PC Sound Card
• Second handset

Note:

For people with impaired hearing the Option unit offers the possibility to amplify the receiving volume in the handset and headset.