Tollgrade Communications, Inc. (Nasdaq:TLGD), a leading supplier of service assurance products and solutions, today announced that it has completed an interoperability and co-marketing agreement with Ambient Corporation (OTCBB:ABTG), a pioneering integrator of smart grid communications platforms, headquartered in Newton, MA. The joint offering will empower electric power utilities with real-time grid intelligence via a robust communications network, enabling them to improve overall efficiency and reliability of energy delivery.

The companies have collaborated to integrate Tollgrade's LightHouse™ software agent and the Ambient Smart Grid® Node, enabling the LightHouse sensors to leverage the communications and remote management services available on the Node. Customers who purchase the joint solution can now deploy LightHouse sensors for outage notification, real-time fault detection and location, and continuous load monitoring and also have the ability to integrate other smart grid applications, such as AMR/AMI, distribution automation, and outage management systems. The Ambient Smart Grid® platform enables the building of an IP network utilizing a variety of standards based technologies to aggregate and transport data from all the smart grid applications.

"The integration of these two innovative products will enable electric power utilities to have the real-time intelligence they need to manage the distribution network and proactively identify and correct network troubles," said Joseph Ferrara, Tollgrade's President and CEO.

John J. Joyce, President and CEO, Ambient Corporation, added, "In today's Smart Grid market, such collaborative efforts between companies such as Tollgrade and Ambient demonstrates what is required to form best-in-class solutions that will create opportunities for faster adoption of new technologies and realization of smart grid efficiencies."

For a discussion regarding the joint solution, which is available for deployment immediately, stop by the Verizon Wireless and Ambient shared booth 139 at DistribuTECH, March 23-25, Tampa FL.

About Tollgrade Communications, Inc.

Tollgrade Communications, Inc. is a leading provider of service assurance products and services for centralized test systems around the world. Tollgrade designs, engineers, markets and supports advanced sensor technologies to provide electric power utilities with continuous grid intelligence. This intelligence provides utilities with the critical information about the state of the distribution grid between the substation and the meter, enabling them to provide service assurance to their customers. For more information, visit Tollgrade's web site at www.tollgrade.com.

The Tollgrade Communications, Inc. logo is available at http://www.globenewswire.com/newsroom/prs/?pkgid=7127

About Ambient Corporation

Ambient designs, develops and markets Ambient Smart Grid® communications technologies and equipment. Utilizing Internet protocol-based open standards technologies along with in-depth industry experience, Ambient provides utilities with solutions for creating smart grid communication platforms and technologies. Headquartered in Newton, MA, Ambient is a publicly traded company (OTCBB:ABTG). For more information, please visit Ambient at www.ambientcorp.com.

Forward-Looking Statements

The foregoing release contains "forward-looking statements" regarding future events or results within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. The Company cautions readers that such "forward-looking statements" are, in fact, predictions that are subject to risks and uncertainties and that actual events or results may differ materially from those anticipated events or results expressed or implied by such forward-looking statements. The Company disclaims any current intention to update its "forward-looking statements," and the estimates and assumptions within them, at any time or for any reason. In particular, the following factors, among others could cause actual results to differ materially from those described in the "forward-looking statements": (a) the inability to complete or possible delays in completing certain research and development efforts that may be required for product release and general availability; and (b) our dependence upon a limited number of third party subcontractors to manufacture certain aspects of the products or third party software providers for the products we sell, including the products which are the subject of this release. Any number of factors that could cause actual events or results to differ materially from those contained in the "forward-looking statements" is included in the Company's filings with the U.S. Securities and Exchange Commission (the "SEC") including, but not limited to, the Company's Form 10-K for the year ended December 31, 2008 and any subsequently filed reports. All documents are also available through the SEC's Electronic Data Gathering Analysis and Retrieval system at www.sec.gov or from the Company's website at www.tollgrade.com

CONTACT: Tollgrade Communications, Inc.

Communications:

Amy Baker

724-612-5137

abaker@tollgrade.com