ONECALL TELECOM Joins AltiGen's Growing Reseller Network

- Increases Reach in Southern States -

FREMONT, Calif., Sept. 4 -- AltiGen(R) Communications, Inc. (NASDAQ:ATGN) , a leading provider of VoIP business phone systems and Unified Communications solutions for small-to-medium businesses (SMBs), announced ONECALL TELECOM, LLC, a reseller of communications services in Memphis, TN, is offering AltiGen's products to its customers. ONECALL chose to offer AltiGen's products based on Max Communications Server's rich feature set and scalability.

"Continued expansion of our reseller channel is a vital part of AltiGen's overall growth," said Jeff Kays, Vice President of Business Development at AltiGen. "ONECALL TELECOM brings a solid existing user base and strengthens our presence in the mid-South region of the United States."

"AltiGen will allow us to sell into businesses that are looking for a complete Unified Communications solution," said Bob Chance, President of ONECALL TELECOM. "When IT Managers are looking for a new phone system, often with exacting requirements, AltiGen's robust feature set with native integration to Microsoft's Exchange Server 2007 gives ONECALL a critical advantage to win the deal by instilling high product confidence with the IT Manager and often exceeding the organization's communications requirements."

"We are most excited about AltiGen's lead generation program," Chance continued. "The fact that AltiGen invests marketing dollars on behalf of their reseller channel to assist them in driving incremental business will help us accelerate our growth and mutual success."

ONECALL TELECOM has been operating for 36 years as a leading telecommunications vendor in the mid-South region of the United States and is committed to providing the very best telecommunication products and service to their customers. In 2000, ONECALL began representing competitive local exchange carriers (CLECs) and now has thousands of customers in more than a dozen states.

About AltiGen Communications

AltiGen Communications, Inc. (NASDAQ:ATGN) is a leading provider of VoIP business phone systems and Microsoft-based Unified Communications solutions for small-to-medium businesses (SMBs), including companies with multiple distributed locations, branch offices and call centers. AltiGen's scalable, integrated, and easy to manage all-in-one Unified Communications solutions enable an array of applications like standards based SIP VoIP phones and servers, unified messaging, voicemail, call recording, conferencing, call activity reporting and mobility solutions that leverage both the Internet and the public telephone network to take advantage of the convergence of voice and data communications. AltiGen's systems are designed with an open architecture and are built on an industry standard platform. This adherence to widely used standards allows products to integrate with and leverage the existing technology investment of partners and customers. For more information, call 1-888-ALTIGEN or visit the web site at http://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 enhance our 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, 2007 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.