AltiGen’s ExtensionAnywhere mobile technology coupled with Multi-Tech Systems’ portfolio of CallFinder cellular gateways offer increased cost savings for companies with remote and mobile workers

Fremont, California, September 28, 2007 — AltiGen® Communications, Inc. (NASDAQ: ATGN), a pioneering manufacturer of VoIP business phone systems and call center solutions, and Multi-Tech Systems, Inc., a leading manufacturer of products that connect voice and data over IP networks, are teaming up to deliver a complete mobile communications solution.By bundling the Multi-Tech CallFinder® GSM and CDMA cellular gateways with the AltiGen Office and MAX1000 series of VoIP Business Phone Systems, the companies seamlessly bridge an AltiGen phone system to a cellular network. The AltiGen - Multi-Tech Systems product combination enables businesses to save telecommunications costs by taking advantage of lower cost cellular networks for routing calls rather than traditional landlines. By utilizing the AltiGen ExtensionAnywhere™ feature to route calls through a cellular network, the CallFinders will provide toll-free calling between headquarters and cell phones in the field. The CallFinder gateways can also provide back-up communications, including emergency 911 services, in the event of central office public switched telephone network (PSTN) failure.

According to Dan Nelson, Vice President of

Fremont, CA – August 27, 2007 - AltiGen Communications, Inc. (Nasdaq: ATGN), a leading provider of next generation IP-PBX phone systems, today announced it plans to present at the Kaufman Brothers 10th Annual Investor Conference at the W Hotel in New York City on September 6, 2007 at 9:10 a.m. ET. Presenting from management will be Jeremiah Fleming, president and COO and Phil McDermott, chief financial officer.

A live webcast of management’s presentation will be accessible from the company’s website: www.altigen.com. In addition, a replay of the webcast will be available.

About AltiGen Communications
AltiGen Communications, Inc. (Nasdaq: ATGN) is a leading manufacturer of VoIP telephony solutions. AltiGen designs, manufactures and markets advanced, IP-PBX telephone systems and IP call centers that leverage both the Internet and the public telephone network. These products enable an array of applications that take advantage of the convergence of voice and data communications to achieve superior business results. AltiGen Communications products are available from independent authorized resellers and strategic partners. AltiGen’s AltiServâ„¢ family of telephony solutions has been recognized for excellence with more than 40 industry awards since 1996. Focused on the small to mid sized and multi-site businesses, AltiGen customers benefit from