DZS Inc (DZSI)

[The Rainmaker]

Zhone Technologies to Report Second Quarter 2009 Financial Results

Zhone Technologies, Inc. (NASDAQ: ZHNE), a global leader in access network solutions, today announced that the company will report its second quarter 2009 financial results on Wednesday, July 22, 2009, after the close of regular market trading.

Zhone will conduct a conference call and audio webcast to discuss further details of its second quarter 2009 results at approximately 2:00 p.m. PT / 5:00 p.m. ET on Wednesday, July 22, 2009. This call is open to the public by dialing [phone] for U.S. callers and [phone] for international callers and then entering passcode 51358333. The audio webcast will be simultaneously available on the Investor Relations section of Zhone's website at http://www.zhone.com/investors/.

A replay of the conference call will be available after the original call by dialing [phone] for U.S. callers and [phone] for international callers and then entering passcode 48028058. An audio webcast replay will also be available online at http://www.zhone.com/investors/ for approximately one week following the original call.

About Zhone Technologies — Access for a Converging World

Zhone Technologies, Inc. (NASDAQ: ZHNE) is a global leader in multi-service access network solutions, serving more than 700 of the world's most innovative network operators. The company offers the industry's only fully-integrated portfolio of MSAP, FTTx, EFM and Wi-Fi access technologies, improving network agility and reducing the costs of delivering the full spectrum of access services, including residential and business broadband, VoIP, and High-Definition IPTV over copper, fiber, and wireless. Zhone is headquartered in California, and its MSAP products are all manufactured in the USA, in a facility that is emission, waste-water, and CFC free. www.zhone.com