Aastra - With Speakerphone - VoIP - Conference Calling - With Intercom - Wall Mountable Featuring a large 144 x 128 pixel graphical backlit LCD display, 12 programmable softkeys offering up to 30 functions, and supporting up to 9 simultaneous calls, the 6737i is ideally suited for heavy telephone users who require many one touch feature keys and a large screen for XML based programs.