“>Until recently, many service providers maintained and operated separatelegacy circuit-switched and packet-switched networks. Traditionally, voiceservices have been offered over circuit-switched networks, commonly known asPublic Switched Telephone Networks (PSTN). On the other hand,connectivity between enterprises for virtual private network (VPN) dataapplications has been provided over packet-switched networks such as Frame Relay(FR) and Asynchronous Transfer Mode (ATM). Of late, ma
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Sunday, February 10th, 2008 at 4:09 pm
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