The freelancer should help defining the right hardware (based on cost x bennefit), provide the lastest full version of the digium SMB Switchvox, install and configure the system.
The hardaware will be for up to 8 analogic land lines, 4 gsm lines, and voip...
The features are all features available as on the SMB version (columm) of [url removed, login to view]
Integrate with sales force, skype, etc (native)
Easy interface for user and admin,
only professional with experience and knowledge,
possibility of ongoing projects toguether (based on quality of this project)