http://www.infinititelecommunications.com.au/phone-systems/phone-system-handsets/alcatel-phone-handsets/alcatel-4029-handset.html

Reviewing the Alcatel 4029 – The navigation key (the silver round button) on the Alcatel 4029 makes access to the systems other functions straightforward, the large screen is easy to see, while the other main function buttons are basically fool proof.
Alcatel has cleverly made them different colours so they stand out. Red flashing means you have a voicemail, orange is to activate speakerphone, yellow is mute. It is a great looking, incredibly well designed handset.

http://www.infinititelecommunications.com.au/phone-systems/phone-system-handsets/alcatel-phone-handsets/alcatel-4029-handset.html