1) xtension evolve is a unified communications application suite that provides presence, instant messaging, call control, Outlook integration, a web directory, and fax server capabilities through a web-based user interface. 2) The presence server module allows for call control and presence/IM functionality while the fax server module enables sending and receiving faxes from desktops in PDF or TIF format. 3) The connect2 and skype2phone modules extend communication capabilities by integrating Skype and mobile devices to allow calling from any device using a single number.