AASTRA 6700i for OpenCom 1000 User Guide EN - Manual (Page 6)

Aastra 673xi / 675xi SIP Telephones
2
The Aastra 6755i and Aastra 6757i models have large and freely programmable
displays for executing system functions.
Aastra 6751i – basic level version of the
Aastra 675xi product family Aastra 6753i – headset jack and six
function keys
Aastra 6755i – comfort display, six
function keys and six softkeys Aastra 6757i – premium display and
twelve softkeys