16 Mobile Carriers Utilize Ditech Networks EXi Solution to Measure Voice Quality

Ditech's EXi is Only Monitoring Solution that Quantifies Voice Quality Problems Caused by Caller's Environment and Mobile Devices

MOUNTAIN VIEW, Calif., Jan. 30 / -- Ditech Networks (NASDAQ:DITC), a leading provider of voice quality solutions to the global communications industry, today announced that audit results from its Experience Intelligence (EXi) solution have been used by 16 mobile service providers around the world to assess voice quality. EXi is the industry's only technology that quantifies voice quality problems caused by the caller's environment and by mobile devices. The solution is gaining acceptance by carriers as a complement to existing measures of voice quality, including technologies that monitor the network, and survey results from firms that poll subscribers.

EXi was introduced to the market in February 2006, and has been utilized to conduct voice quality audits for 16 carriers operating in 12 countries. The software application unobtrusively assesses voice quality on live mobile calls to derive an R-Factor and a Mean Opinion Score (MOS), which are commonly used standards in the telecommunications industry. When combined with existing voice quality tests, EXi completes the picture of voice quality as it is actually experienced by subscribers, by adding to the partial view already provided from network-induced impairments.

The service providers who have used EXi audit data are primarily tier 1 mobile carriers operating in North America, South America, Europe, Asia and the Middle East.

"Ditech's EXi solution is gaining momentum in the market as an important complement to existing drive tests, surveys and network monitoring systems," said Todd Simpson, President and CEO of Ditech Networks. "EXi remains the industry's only technology to quantify the impact of the caller's environment and mobile devices on call quality."

EXi is a software application that is deployed in mobile and VoIP networks on Ditech's hardware platforms. The solution uses an industry-standard model to assess voice quality. Called the International Telecommunications Union (ITU) G.107 E-Model, this methodology identifies and measures voice quality impairments that originate in the caller's environment and devices, in addition to network infrastructure. The data is used to derive an R-Factor and MOS, which both rate the acceptability of voice quality to subscribers. The E-Model was used to assess information captured unobtrusively from millions of live mobile calls in real-time.

"Although the E Model has been available in the industry for several years, Ditech Networks is a leader in its implementation for voice quality impairments that are external to the network," said Jessy Cavazos, an analyst at Frost & Sullivan who focuses on the communication test equipment and system industry. "The E Model provides an important new Key Performance Index (KPI) for service providers as they track the impact of voice quality on the subscriber's call experience."

About Ditech Networks

Ditech Networks is shaping the future of voice quality through continuous innovation and leadership for the world's communications companies. Ditech's voice quality solutions are deployed in wireless and wireline networks to optimize the call experience. By delivering consistent, dependable voice quality, Ditech's products help global communications companies meet the multiple challenges of service differentiation, network expansion and call capacity. Ditech's customers include Verizon, Sprint/Nextel, Orascom Telecom, AT&T, China Unicom, Global Crossing and West Corporation. Ditech Networks is headquartered in Mountain View, California. For more information, visit www.ditechnetworks.com/.

Source: Ditech Networks

Media, Rob Adler
+1-415-984-1970, for Ditech Networks

Web site: www.ditechnetworks.com/

Ditech released a white paper in November 2007 on utilizing the E Model as the new voice quality KPI. The white paper is available on Ditech's website at www.ditechnetworks.com.

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