Clarity Communication Systems Inc. Announce Expanded Portfolio of Push To Talk (PTT) Handsets.

SIP based Push-To-Talk Solution Can be Downloaded to Many Existing Popular Cell Phones

AURORA, Ill. -- Clarity Communication Systems Inc., recently acquired by ISCO International (AMEX:ISO), announced today that it has developed the technology to achieve a built-in PTT capability on phones that are not specifically designed for PTT. This PTT client software uses Qualcomm's standard BREW(c) Application Programming Interface, and can be certified for a wide variety of popular cell phones.

Previously, the cost to adapt a handset to support PTT capability was substantial, and the result was a strict limitation on the number of PTT handsets that could be offered by a mobile operator. With Clarity's innovations for their inTouch PTT Client, any handset that fully supports BREW version 3.1 or later can be certified for use with Clarity's inTouch PTT Solution, the industry's best performing Session Initiation Protocol based PTT solution.

"This is a breakthrough that overcomes the single, most often heard challenge to the adoption of PTT - the lack of PTT capable handsets," said Jim Fuentes, General Manager of Mobile Solutions for ISCO International. "With our inTouch PTT Client, popular phone models can now be used for instant PTT communications by simply downloading our application."

Cellular phones from multiple manufacturers are targeted by Clarity for release over the next few months. Each device will be thoroughly tested by Clarity and certified by Qualcomm for use prior to release. Handsets already certified include the Kyocera KX440 and KX12, and the Motorola 323i, L7C SLVR and W385. Handsets in certification testing are the Motorola K1M KRZR and Z6M ROKR.

"We are inviting our current and prospective customers to submit requests for the devices they want certified," said Bill Jenkins, Vice President of Product Management. "Our customers have been asking for this capability for a long time, and we're delighted that we've achieved the breakthroughs that allow us to bring it to them," he added.

About Clarity and ISCO International

Clarity (www.claritycsi.com) specializes in the design, development and deployment of solutions for mobile devices and wireless networks. ISCO International (www.iscointl.com) is a leading global supplier of radio frequency management and interference-control systems for the wireless telecommunications industry and mobile operators. Combined, the companies provide the wireless market with highly differentiated solutions, including adaptive interference management; PoC and PTx applications and hosted solutions; RF conditioning for all wireless technologies; location based applications and services; and novel, situational aware applications that combine both PoC and location enablement.

Qualcomm and BREW are copyrights of Qualcomm, Inc.

Safe Harbor Statement

Because ISCO wants to provide investors with meaningful and useful information, this news release contains, and incorporates by reference, certain "forward-looking statements" that reflect ISCO's current expectations regarding the combined entity's future results of operations, performance and achievements. ISCO has tried, wherever possible, to identify these forward-looking statements by using words such as "anticipates," "believes," "estimates," "looks," "expects," "plans," "intends" and similar expressions. These statements reflect ISCO's current beliefs and are based on information currently available to it. Accordingly, these statements are subject to certain risks, uncertainties and contingencies, which could cause the combined entity's actual results, performance or achievements to differ materially from those expressed in, or implied by, such statements. These factors include, among others, the following: market acceptance of the combined entity's technology; the spending patterns of wireless network operators in connection with the build out of ISCO's 2.5G and 3G wireless systems; ISCO's ability to obtain financing in the future if necessary; ISCO's history of net losses and the lack of assurance that ISCO's earnings will be sufficient to cover fixed charges in the future; uncertainty about the combined entity's ability to compete effectively against better capitalized competitors and to withstand downturns in its business or the economy generally; the risks of foreign operations; continued downward pressure on the prices charged for the combined entity's products due to the competition of rival manufacturers of front-end systems for the wireless telecommunications market; the timing and receipt of customer orders; ISCO's ability to attract and retain key personnel; the combined entity's ability to protect its intellectual property; the risks of legal proceedings; ISCO's to successfully integrate the combined entity. A more complete description of these risks, uncertainties and assumptions is included in ISCO's filings with the Securities and Exchange Commission, including those described under the heading "Risk Factors" in the Company's Annual Report on Form 10-K filed by ISCO with the Securities and Exchange Commission. You should not place undue reliance on any forward-looking statements. Neither ISCO nor Clarity undertakes any obligation to release publicly the results of any revisions to any such forward-looking statements that may be made to reflect events or circumstances after the date above or to reflect the occurrence of unanticipated events.