OPENSTAGE is the design award winning phone family with following different models:

OpenStage 10 T is a wall mountable entry model TDM telephone with basic features and three preconfigured function keys.
OpenStage 15 is a cost-effective telephone with eight free programmable function keys and a two line display. Available as SIP, HFA and TDM phone.
OpenStage 20 is a full-featured speakerphone with intuitive and interactive user interface. A universal solution for efficient and professional telephony. Available as TDM, HFA and SIP phone.
OpenStage 30 T is a multi functional telephone with eight free programmable function keys and a two line display. Available as TDM phone.
OpenStage 40 is recommended for use as an office phone, e.g. for desk sharing, people working in teams or call center staff. Available as SIP, HFA and TDM phone.
OpenStage 60 combines a maximum of usability with a clear intuitive and sleek design. Applications and personalisation options make this phone the first choice for boss-/secretary environments and people interacting with lots of other devices. Available as SIP, HFA and TDM phone.