FREMONT, Calif., June 26 -- AltiGen® Communications, Inc. a pioneering manufacturer of VoIP business phone systems and call center solutions, announced today that it has been awarded U.S. Patent No. 7,058,047 for technology related to the automatic capturing of computer network call-back data used for improved telephone messaging.

Typically, when users retrieve their voice mail messages, the caller leaves a message and a number they can be reached at, also known as a callback number. When the user wants to return that call, the user must scribble down the callback number on a piece of paper and return the caller's call. When the user has a great number of messages to return, these scraps of paper can get shuffled around or lost. As a result, the user may not be able to return the message. Even if the user can find the number, he/she must manually dial it.

The solution to reduce the need for voicemail users to write down callback numbers left in their mailboxes has been through the use of callback technology. AltiGen Communications, the assignee of the present invention is one of the pioneering companies in the area of callback technology. Pioneered by AltiGen Communications, principles of computer telephony are now being adapted for telecommunications systems utilizing computer networks for the transmission of data. This patent outlines the automatic capturing of the caller's call-back data, such as an IP address, and allowing the user of the telecommunications system to automatically return the missed caller's call without the need for listening or writing down the caller's callback information.

"This invention is an important addition to our existing patent portfolio, demonstrating AltiGen's track record of innovation in the communications industry," said AltiGen CEO Gilbert Hu. "Our commitment to bringing useful and productivity enhancing features to our customers is an important part of AltiGen's continued success."

This patent, awarded on June 6, 2006, is the latest addition to AltiGen Communications' existing portfolio of 12 other U.S. patents including other automated caller callback methods and a Computer Network-based Auto Attendant method allowing for geographically dispersed multi-location systems to share auto attendant and IVR information over data networks.

About AltiGen Communications
AltiGen Communications, Inc. (Nasdaq: ATGN ) is a pioneering manufacturer of VoIP business phone systems and call centers 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 AltiServ(TM) 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 integrated solutions that protect their existing investments, while providing new ways to be more competitive, productive and to save money. 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 call center solutions in the SMB market, and our ability to successfully obtain additional patent approvals for important inventions to our existing patent portfolio. 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, 2005 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.