Rewrite Services for Internet Telephony

The easiest, albeit the most intrusive, manner to make PSTN services available in Internet telephony is to rewrite all the existing PSTN services for the Internet environment. Although technically feasible, this is not a good solution. It takes anywhere from 6 months to a year to get a PSTN service specified, implemented, tested, and deployed. This already assumes a stable service delivery infrastructure as it exists in the PSTN. Internet telephony, being a new medium, does not as yet have a well-specified service architecture that can be leveraged to deploy new services. The service architecture for Internet telephony is in the early stages of being proposed, as we discovered in Chapter 2. All these factors make it extremely difficult and, in fact, undesirable, to replicate existing PSTN services from the ground up in the Internet domain.

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