Snom D3

Expansion module

Key features

  • 18 freely programmable, colored LED keys
  • Plug-and-play
  • Expandable with up to two additional modules
  • Power supply via telephone using USB connection

The extension module for the Snom D3xx series

The Snom D3 is the optimal expansion module for the Snom D3xx series desk phones with USB connection.

The expansion module allows users who make a lot of calls greater flexibility and productivity by providing 18 programmable LED function keys with features such as line hold, speed dial, extension and presence indication.

The Snom D3 with its high-resolution black-and-white display can be easily connected via plug-and-play using a USB cable. Up to three extension modules can be connected in series to expand the range of functions enormously. This provides up to 54 additional function keys.


  • Please note that from the second connected D3 onwards, this must be supplied with power using an additional Snom power supply unit. This will then power the second and, if desired, the third D3 in the series.
  • As each D3 has a USB port, other devices such as a USB headset can be connected to the last connected D3 in the series.


18 programmable,
multi-coloured LED keys

The keys can be assigned with all functions available on the Snom phones, e.g. short and direct dial or extension. The multicolour LEDs indicate the call and presence status of a direct dialling.

Graphic B/W display

The monochrome display offers excellent contrast and visibility in all lighting conditions.

Up to 3 expansion packs can be combined

If you really need a lot of programmable function keys, the Snom D3 is just right for you, because you can connect up to 3 in a row to each Snom desk phone.

Overview of Series

Technical features


Expansion module connectable

To have additional speed dial or BLF keys available on your desk phone, this device can be supplemented with expansion modules.


Plug & Play

This device comes with Plug & Play. This means you can use accessories connected via USB without rebooting the phone.


Self-labeling keys in additional display

Unlike in the past, where the freely programmable function keys were labeled by means of paper, this device has labeling in a display.


USB port

This device has at least one USB port.


Help with questions about products, availability and prices


Contact person

Snom HQ Berlin

+49 30 39833-0

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Snom is available all over the world. If you are looking for a wholesaler, you can find here all our partner distributors sorted by country.


Find the right telephone system (PBX).


List of our compatible PBX


If you would like to know whether your desired phone is compatible with the PBX you are using, you can view the on our PBX partner overview page in the Service Hub.



Information on choosing a PBX


Do you need information when choosing a suitable PBX for your desired telephone? We have compiled some tips for you in the guide on what you should look out for.


Technical data




Expand all add
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The latest firmware for your Snom device can be found at the link below. When updating, please follow all safety instructions and take into account which firmware version is currently permitted by the PBX you are using.

You may not be able to update your Snom device manually, but only via the web interface of your PBX.


How To´s, FAQ & Co.

In the Service Hub we have created a variety of instructions and help for you.


Contact person

Headquarter Berlin

+49 30 - 39833-0
Office hours: Mo-Fr 9:00-17:00 (CET)


Inhouse Sales
Inhouse Sales

language Sales DACH

phone +49 30 39833 0



Snom Technology GmbH
Aroser Allee 66
13407 Berlin

Phone: +49 30 39833-0
Fax: +49 30 39833-111


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