Integration of the phone set (cell or land line) into the company phone system. For instance, if it is impossible to find a person by the office phone, then with the help of the integrated cell phone one can set a call redirection to a cell or another telephone number, in case if that telephone is also unavailable the call will be redirected to a voice mail.
Virtual phone numbers provider with free advanced phone system included. Can connect VoIP phones in for incoming/outgoing. Multiple other forwarding options available.