ENUM: Call Routing in an all IP World
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One of the challenges created by the IP evolution is how to interface the PSTN to IP networks, which utilize different numbering schemes, to enable the seamless delivery of calls between the two domains. Although still in relative infancy, electronic number mapping (ENUM) appears to be the solution. This whitepaper explores ENUM and its different implementation types, introduces the concept of the subscriber routing database (SRdB) and describes how the SRdB improves network efficiency and delivers cost savings for operators.
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