COMfortel® D-XT20i

Scalable extension – Maximum variety in business communications

Intuitive user interface

Brilliant high-resolution 4.3” display

20 self-labelling function keys incl. LED signalling

USB connection for additional key extensions

Up to 3 key extensions per telephone COMfortel® D-210, D-400 and D-600

Your advantages in detail

The COMfortel D-XT20i simplifies the workflow for frequent call makers: its 20 speed dialling and function keys per extension module provide fast access to keystrokes. The status is visible at a glance via the LED signalling – so you always keep the overview!

Thanks to the high-resolution 4.3" display and the intuitive user guidance, you can enjoy all the functional enhancements easily and quickly.

Compatible products

Features & technical data

Everything you need to know about our products comes now. Scroll down for more information.

Comfort Features

  • 20 self-labelling and freely programmable function keys with multi-coloured status signalling
  • Automatic backlight with adjustable brightness and switch-off time
  • Telephone tilt angle: 30° or 45°
  • Plug and Play
  • Power supply via the telephone’s USB connection1
1 If more than one COMfortel D-XT20i is connected to a telephone, the optional COMfortel D-XT-PS must be connected to the second COMfortel D-XT20i key extension.



Power supply 1

via the telephone’s USB connection or external power supply 15 V DC, 1.5 A


USB 2.0 for up to 3 key extensions COMfortel D-XT20i

Operating elements

20 freely programmable and self-labelling function keys each with 3 levels, 2 keys for shifting levels quickly


TFT colour display (4.3" / 10.9 cm, 272 x 480 pixels) with 65,536 colours





Dimensions (w x h x d)

123 mm x 133/100 mm x 145/195 mm


approx. 287 g


CE, EN 55032, EN 55024, EN 55035

Delivery Scope

  • Basic unit COMfortel D-XT20i
  • Device base
  • Connection cable (USB)
  • Quick start guide


COMfortel® D-210

Professional SIP-Phone  –  amazing range of premium functions despite almost entry-level price

COMfortel® D-400

Office or home office – the COMfortel D-400 SIP phone is the professional choice

COMfortel® D-600

High-level design – COMfortel D-600, the premium SIP device


COMfortel® D-XT-PS

Plug-in power supply for the power supply of the second and third key extension module

Top Sellers

Sales Configurator (SC)

- the easy way to the right system

Customer requirements for communication solutions are constantly increasing and with them the complexity and scalability of ITC systems. Project planning therefore takes up more and more time. Here, the free Sales Configurator offers a simple and fast solution. It gives you the opportunity to efficiently plan communication solutions and create project planning proposals.

Sales Configurator (SC)