PRESS RELEASE

August 20, 2009 " Tata Communications, a leading provider of a new world of communications, today announced that it will start providing built-in Distributed Denial of Service (DDoS) detection and mitigation services as part of its Dedicated Internet Access offering in North America.

With the launch of its Internet Clean Pipe service, Enterprises will be able to leverage Tata Communications' global network and Managed Security Service (MSS) offering to mitigate DDoS attacks. The Internet Clean Pipe service rides on the world's largest DDoS scrubbing architecture* that is able to absorb the enormous traffic volumes generated by botnets, buying time to activate countermeasures.

DDoS attacks are the single biggest risk to a company's Internet connectivity as they consume or most of the network bandwidth and their prevention can save companies many millions of dollars in business costs a year. This is especially so for companies that depend on the Internet as a business platform as well as companies that leverage the Internet as an element of their core IT infrastructure. Most recently, popular social media platforms, as well as some US government and South Korean web sites succumbed to DDoS attacks which saw them sustain considerable reputation damage.

To mitigate DDoS attacks before they start to block traffic to the targeted enterprise, the Internet Clean Pipe service is able to absorb attacks the moment the attack traffic is detected on Tata Communications' global IP backbone. Due to its extensive network presence, Tata Communications has the network scale needed to negate DDoS incidents before they turn into crisis situations that can create reputation and liability issues for companies.

Tata Communications' Internet Clean Pipe offering leverages technology from Arbor Networks, a market leading DDoS mitigation specialist, and rides on Tata Communications' global Tier-1 network with 1.5Tbps capacity meshed with 10G backbones, which extends into more than 200 countries and territories. Tata Communications currently offers the world's largest DDoS detection and mitigation service built into a global IP backbone*. The service scrutinizes network traffic in real-time to identify anomalies and quarantine attack packets and block malicious traffic. It also makes use of sophisticated detection techniques including built-in attack profiles, and statistical and behavioral analysis methods to quickly identify attacks in progress.

Danny McPherson, Chief Security Officer of Arbor Networks, said: "Recent incidents such as those involving social networking, government, and commercial targets over the past month should serve as a stark reminder to any Internet-connected organization that DDoS remains a very real threat, and if unprepared, may result in considerable business impact. With the scale and sophistication of attacks today, enterprises must cooperate with their network services provider to obtain adequate protection in the event of such attacks."

Tata Communications' Internet Clean Pipe service leverages reliable network-based defense while simultaneously optimizing bandwidth utilization. By removing attack traffic within the Tata Communications' IP backbone, the managed service solution rapidly clears threats in the cloud before they can hit the customer network. This approach is far superior to conventional premise-based defense technology.

John Landau, Tata Communications' Senior Vice President for Global Managed Services, said: "Tata Communications' Internet Clean Pipe service identifies DDoS attacks well before the traffic reaches a customer's network and mitigates the attack within the huge capacity of Tata Communications' backbone. For customers, the service provides an effective and very affordable single-supplier combination of internet connectivity with protection against the DDoS attacks that could otherwise seriously damage their internet dependent business."

Customers of the service can also tap into Tata Communications' 24x7 monitoring and immediate notification service, comprehensive event reporting, and security professionals at its ISO 27001-certified global operations center.

*Arbor Networks PR - May 6, 2008 For more information on Tata Communications' MSS offering visit: http://www.tatacommunications.com/enterprise/security/

About Tata Communications Tata Communications is a leading global provider of a new world of communications. With a leadership position in emerging markets, Tata Communications leverages its advanced solutions capabilities and domain expertise across its global and pan-India network to deliver managed solutions to multi-national enterprises, service providers and Indian consumers. The Tata Global Network includes one of the most advanced and largest submarine cable networks, a Tier-1 IP network, with connectivity to more than 200 countries across 400 PoPs, and nearly 1 million square feet of data center and collocation space worldwide. Tata Communications' depth and breadth of reach in emerging markets includes leadership in Indian enterprise data services, leadership in global international voice, and strategic investments in operators in South Africa (Neotel), Sri Lanka (Tata Communications Lanka Limited), Nepal (United Telecom Limited), and subject to approval by the Chinese government, China (China Enterprise Communications) Tata Communications Limited is listed on the Bombay Stock Exchange and the National Stock Exchange of India and its ADRs are listed on the New York Stock Exchange. (NYSE: TCL) www.tatacommunications.com