PALO ALTO, CA--(Marketwire - April 22, 2008) - The Radicati Group, Inc. has released a new market brief on the "On-Premises Unified Communications" segment of the Unified Communications market, which analyzes the market's highly competitive landscape.

The Radicati Group, Inc. segments the Unified Communications market into four distinct segments: on-premises UC products, Hosted UC Services, Telecom UC Services, and UC Platforms for Service Providers. This study focuses only on the on-premises UC product market segment, which are products deployed by enterprise organizations of all sizes to provide UC functionality to their users.

Radicati Market Quadrants rank vendors in this market based on a four quadrant system, which includes "Mature Players," "Specialists," "Trail Blazers," and "Top Players" quadrants. Leading players in each market segment are ranked based on the features and functionality of their solution, as well as their market share in that segment. Radicati Market Quadrants provide a comparative viewpoint of the market, and a brief analysis of each vendor is included in the study, including both strengths and weaknesses.

Companies evaluated in the report include: Active Voice, Alcatel-Lucent, Avaya, Applied Voice & Speech Technologies, Cisco Systems, CommuniGate Systems, Genesys Telecommunication Laboratories, IBM, Interactive Intelligence, Microsoft, Mitel Networks, Nortel Networks, Siemens AG, and TOPCALL International AG.

To order a copy of the study, or for additional information please visit our web site at, or call (650) 322-8059.

About The Radicati Group, Inc.

The Radicati Group covers all aspects of e-mail security, e-mail archiving, regulatory compliance, wireless technologies, web services, identity management, instant messaging, unified communications, VoIP, and more. The company provides quantitative and qualitative information, including detailed market size, installed base and forecast information on a worldwide basis, as well as detailed country breakouts.

The Radicati Group works with corporate organizations to assist them in selecting the right products and technologies to support their business needs, as well as with vendors to define the best strategic direction for their products. We also work with investment firms on a worldwide basis to help them identify and assess investment opportunities.

The Radicati Group, Inc. is headquartered in Palo Alto, CA, with offices in London, Hong Kong, and Melbourne.

Contact Information: Contact: Sara Radicati The Radicati Group, Inc. (650) 322-8059