There are several firms that offer the complete and reliable Microsoft-based IP phone systems for communication purpose. The IP phone systems are largely suitable for business purpose.

The system by default should be based on open standards. They should offer pre-packaged IPPBX and other facilities such as auto attendant to eliminate human monitoring - handling, messaging functionality and IVR. Enhanced systems will come along with Office desktop plug-ins (Microsoft .NET).  

If the aim is to maintain your work flow at the office, by keeping the communication platforms robust and flexible then IP phone systems will act as a complete, comprehensive converged mode for voice-data transmission. The IP Phone Systems make communications efficient and effective. It is recommended for small scale businesses and even those enterprises with massive communication needs across branches, such as financial services and law firms.

IP Phone systems employ the IP/Data networks for the purpose of voice media transport and signaling. These provide enhanced features as compared to those offered by conventional PSTN phones. The former can be utilized with wired as well as wireless network interfaces for accessing packet networks and are meant for enterprise as well as residential applications. Look for a service provider willing to give the most comprehensive and optimized IP Phone software for purpose of Voice Media Processing and signaling.