Check out http://www.mightycall.com, all the features of many of the small business phone solutions listed above + integrated social channels, activity queue and more.
A virtual phone number is a telephone number without a phone line directly associated with it. Instead of being connected to one specific telephone line, a virtual number is programmed to forward incoming calls to one of the pre-set telephone lines that the client chooses, be it fixed, mobile or VoIP. Virtual phone numbers are also known as access numbers since they can work as a gateway between traditional calls and VoIP.

All service plans offered by eVoice include call forwarding, inbound fax, auto-attendant, and voicemail. Users can add outbound fax capabilities for less than two dollars per month. The platform also provides a mobile app that can be used to make outbound calls, receive inbound calls, check voicemails, create schedules for call forwarding, and alter call settings.
The AT&T Synapse works the way you do — no headaches, hassles or hidden costs. Large backlit displays, web-based system administration, familiar call handling and features, scheduled-based auto attendant, built-in voicemail, dial-by-name (first or last) functionality, and inbound call routing rules, the Synapse has the most features in its class.