AltiGen Communications signs distribution agreement with Commtech

Dublin, Ireland, Wednesday, 4 May 2005 — AltiGen® Communications, Inc. a leading provider of next generation IP telephony systems, today announced it is partnering with Commtech, a leading distributor of Internet, Networking and Security solutions in Ireland, to distribute AltiGen’s award winning IP phone systems and call centre solutions to the Irish market. The partnership is another step in AltiGen’s continuing strategic plans for growth in Europe.

“We see Commtech as a strategic distribution partner to support the unique needs of this emerging market,” said Mike Plumer, AltiGen’s Vice President of Sales. “Commtech’s proven track record in selecting quality products and successfully penetrating the Irish marketplace through its energized and significant reseller base is a powerful combination.”

Commtech will be a specialist distributor of AltiGen technology and a key component in delivering complete VoIP and IP convergence solutions in the small and mid-sized enterprise market. Commtech will also provide independent advisory and installation services to support the AltiGen reseller channel community.

“Commtech is delighted to work with AltiGen Communications, a leader in IP PBXs and contact centre solutions, and we are excited to offer and promote their leading telephony products here in Ireland,” stated Justin Owens, Managing Director of Commtech. AltiGen’s superior product offering is well suited to the Irish market and we have a tremendous opportunity to build a quality network of authorized resellers in this market. “Commtech can now offer our customers current technology with state of the art functionality to assist and deliver the types of telephony and call centre solutions needed in this market,” he added.

About AltiGen Communications
AltiGen® Communications, Inc. (NASDAQ: ATGN), is a leader in the IP telephony and contact centre market. The company designs, manufactures and markets next generation, IP-PBX telephone systems and IP contact centres that use IP networks, the Internet and the public telephone network to enable an array of applications that take advantage of the convergence of voice and data communications. AltiGen Communications products are available from authorized distributors and resellers AltiGen’s AltiServ has been recognized for excellence with more than 35 industry awards since 1996. Deloitte & Touche® has named AltiGen, as the 111th fastest growing company in the U.S. AltiGen Communications remains the leading manufacturer of delivered next-generation business telephony for the SMB market and is a certified Microsoft® Gold ISV. For more information, call 1-888-ALTIGEN or visit the web site at www.altigen.com.

About Commtech
Commtech is a leading Irish Distributor of specialist network and Internet security products and services. Partnering with key leaders in the industry, Commtech offer superior new security technology coupled with network security training and support to satisfy local market needs and requirements.

Commtech work with a nationwide network of resellers, and Internet Service providers, supplying best of breed products such as: SonicWALL, Cyberguard, Barracuda Networks, N2H2, TUT Systems, GFI Software, Kerio Internet Security Software and AltiGen VoIP solutions.

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 call center solutions in the small to midsize marketplace, our successful partnership with Commtech in the Irish marketplace and their success in penetrating into the small and mid-sized enterprise market in Ireland. 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 the Company's most recent 10Q for the quarter ending March 31, 2005 and the 10K for the year ended September 30, 2004. AltiGen assumes no obligation to update the forward-looking information contained in this press release.

For more information please contact:
Justin Owens, Commtech: +353 1 8091230
Jillian Godsil, PRG: + 353 55 294 55