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West Corporation Chooses Ditech Networks' Packet Voice Processor for National Deployment
[September 12, 2006]

West Corporation Chooses Ditech Networks' Packet Voice Processor for National Deployment

BOSTON, VON Fall, Sept. 12 /PRNewswire-FirstCall/ -- Ditech Networks , a leader in the development of voice processing solutions for communications networks, today announced that InterCall, the largest dedicated conferencing service provider in the world and a subsidiary of West Corporation, has chosen Ditech Network's Packet Voice Processor (PVP) for use in its new voice over IP (VoIP) conferencing service. Ditech's PVP will give InterCall a higher degree of control over the quality of the IP-based voice conferencing traffic transported across the public Internet. Ditech equipment will be instrumental in assuring voice quality for thousands of InterCall conferencing customers across the country.

"West is the leader in traditional conferencing services, and we will match -- or exceed -- that conferencing quality for customers using our new VoIP service," said Mike Brown, vice president of network operations for West Corporation. "We view the Ditech PVP solution as integral to assuring VoIP conferencing quality."

The Ditech Packet Voice Processor platform builds upon Ditech's expertise in voice processing to provide carriers with a solution for ensuring high voice quality in packet-based networks while simultaneously maximizing call capacity. Features based on Ditech's hallmark Voice Quality Assurance(TM) (VQA(TM)) software suite such as acoustic and hybrid echo cancellation, Adaptive noise reduction and Packet Quality Assurance(TM) (PQA(TM)) offer advanced voice quality processing capabilities for InterCall to deliver a high quality conference calling experience to their business customers. The PVP's wide range of codec transcoding capabilities offer lower-cost voice transmission and enable InterCall to serve a broad range of VoIP callers. Advanced voice quality monitoring capabilities enable carriers to quickly pinpoint network trouble points, receive automatic alerts, and gain advanced features for reporting customer service level agreements.

"The PVP gives us a high degree of control over the customer experience," said Mike Mateer, director of systems development for West. "We gain control of which codecs we offer customers, control over echo and background noise that seeps into VoIP conversations, and the ability to restore packets that are inevitably lost with IP transmissions. The net effect is we can deliver a higher quality VoIP conference to our customers."

"We are delighted to become part of InterCall's innovative VoIP service," said Tim Montgomery, President and Chief Executive Officer of Ditech Networks. "Packet-based voice services are a rapidly growing market segment for our carrier and service provider customers, and the Packet Voice Processor will play an integral role in enabling leading service providers to deliver compelling communications services over VoIP. We look forward to working with InterCall and participating in its successful new offering."

About West Corporation and Intercall
West Corporation is a leading provider of outsourced communication solutions to many of the world's largest companies, organizations and government agencies. West helps its clients communicate effectively, maximize the value of their customer relationships and drive greater profitability from every interaction. The company's integrated suite of customized solutions includes customer acquisition, customer care, automated voice services, emergency communications, conferencing and accounts receivable management services.

Founded in 1986 and headquartered in Omaha, Nebraska, West has a team of 28,000 employees based in North America, Europe and Asia. For more information, please visit .

InterCall is the largest service provider in the world specializing in conference communications. The company serves more than 400,000 individual conference leaders in more than 70,000 organizations around the world with audio, event, web, and video conferencing solutions. A subsidiary of West Corporation, the company is headquartered in Chicago, Illinois. For more information, please visit .

About Ditech Networks
Ditech Networks supplies voice processing equipment for telecommunication networks around the world. Ditech Networks' solutions incorporate advanced voice processing, Session Initiation Protocol (SIP), and security technologies delivered on carrier-grade scalable platforms to enhance the delivery of communications services over mobile, Voice over IP, and wireline networks. Ditech Networks' customers are premier network operators including Verizon Wireless, Sprint/Nextel, Orascom Telecom, and others that collectively serve more than 150 million subscribers. Ditech Networks is headquartered in Mountain View, California. For more information, visit

Forward Looking Statement
The statements in this news release regarding the benefits that West Corporation and carriers will receive from deploying the Packet Voice Processor, and that the Packet Voice Processor will play an integral role in enabling leading service providers to deliver compelling communications services over VoIP, are forward-looking statements subject to a number of risks and uncertainties, including the risk that alternative and cheaper voice processing technologies may become available to West Corporation and to other leading service providers.. Other risks relating to Ditech are detailed in the section entitled "Future Growth and Operating Results Subject to Risk" in Part I, Item 2 of Ditech's Quarterly Report on Form 10-Q for the fiscal quarter ended July 31, 2006 (filed September 11, 2006 with the Securities and Exchange Commission).

Ditech Networks

CONTACT: press, Janine Fogal, +1-650-623-1469, or investors, BillTamblyn, +1-650-623-1309, both of Ditech Networks

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