I propose the solution with following features:

-Administration (The intuitive Windows-based Administrator gives you onscreen access to all system administration functions from any PC on the network or by remote network log on)
-Auto Attendant
-Instant Messaging
-Viewpoint (you can point and click to play voice messages, place and receive calls, manage multiple active calls, access contacts and users etc)
-Voicemail
-Reporting tools (User Activity, Average Wait Time and Call Volume by Time of Day Report, Trunk Performance Report and many others)
-Real-time statistics
-Call recordings
-SIP and H323 support
-Support for PSTN connection through Dialogic Boards
-Skills based routing
-Call forwarding
-Conferencing
-Music on hold
-Call History/Tracing

For more details please email to ipmiracle@gmail.com.
I am available for chat at MSN ipmiracle@gmail.com or Yahoo, Yahoo ID is ipmiracle.

Warmest wishes,
Roby Santos