AltiGen Communications Ranked as a Top Supplier of Enterprise VoIP Systems

FREMONT, CA--(Marketwire - May 14, 2009) - AltiGen Communications, Inc. (NASDAQ: ATGN), a leading provider of 100 percent Microsoft-based VoIP business phone systems and Unified Communications solutions, today announced that the Gartner Group has ranked AltiGen as the #7 US-based vendor in the worldwide enterprise telephony market in 2008. The Gartner report, published in May of this year, is based on total enterprise telephony extension line shipments. The report also concluded that:

--  Enterprises are increasingly making telephony decisions in conjunction
    with unified communications (UC) decisions, to ensure long-term integration
    into UC strategies
--  Suppliers' UC solutions' ability to integrate multiple devices across
    multiple communications channels has become a key purchase consideration
--  Now, more than ever, justifying future projects is closely tied to
    return on investment (ROI) and cost factors
    

Jeff Kays, AltiGen's Vice President of Business Development, stated, "Considering the major technology companies selling enterprise telephony systems, we are extremely proud of our position as the #7 US-based vendor in the worldwide telephony market. Our products have been specifically designed to integrate with Microsoft technologies to deliver a seamless, cost effective Unified Communications solution. The results in the report demonstrate that customers and business partners are becoming increasingly aware of the value of Unified Communications and are turning to AltiGen for the solution."

Jerry Fleming, AltiGen's President and COO, added, "This report reinforces our strategy to leverage the growing market trend toward Unified Communications. In addition, our ability to integrate enterprise communications across multiple communications channels and devices, coupled with our value-pricing model, delivers superior ROI for our customers. In today's market environment, as Gartner noted, ROI is more important than ever in justifying new projects."

About AltiGen Communications

AltiGen Communications, Inc. (NASDAQ: ATGN) is a leading provider of 100 percent Microsoft-based VoIP business phone systems and Unified Communications solutions. Having more than 10,000 customers around the world, AltiGen solutions are designed for high reliability, ease of use, seamless integration to Microsoft infrastructure technologies, and are built on a scalable, open standards platform. AltiGen's worldwide headquarters is in Silicon Valley, California, with international operations based in Shanghai, China. Local sales, service and support are provided by AltiGen's worldwide network of over 300 certified partners. For more information, call 1-888-ALTIGEN or visit the web site at www.altigen.com.

Safe Harbor Statement

This press release contains forward-looking statements within the meaning of Section 21E of the Securities Exchange Act of 1934, including, without limitation, statements regarding the continued market acceptance of our Voice over IP telephone systems and AltiGen's ability to successfully grow its value added reseller channel. These statements reflect management's current expectation. However, actual results could differ materially as a result of unknown risks and uncertainties, including but not limited to, risks related to AltiGen's limited operating history. For a more detailed description of these and other risks and uncertainties affecting AltiGen's performance, please refer to AltiGen's Annual Report on Form 10-K for the fiscal year ended September 30, 2008 and all subsequent current reports on Form 8-K and quarterly reports on Form 10-Q. All forward-looking statements in this press release are based on information available to AltiGen as of the date hereof and AltiGen assumes no obligation to update these forward-looking statements.