Recent US. regulations mandate the privacy and securig of healthcare data at a level never previously contemplated. Our research group is developing a prototype healthcare IT system and medical data portal based upon a web services approach. An authentication web service manages trust levels, issues authorization tickets, and uses biometric devices to establish identity; an authorization web service determines what data may be accessed, in what way, and by whom. Hospital administrators set access privileges for recursively-dejned groups, subgroups, and individuals. All patient record and medical images are protected using AES encryption with 256-bit keys. Off-network entities such as pharmacies, insurance companies, and other medical service providers participate through a federated trust-sharing arrangement. Electronic prescriptions are transmitted securely to participating pharmacies and pick-up notiJications are provided to the patient using the preferred notzjkation method (email, alerts to a PDA, automated telephone call) stored in the patient's profile.
In SIP-based networks, there is a need to provide basic network media services. Such services include network announcements, user interaction, and conferencing services. These services are basic building blocks, from which one can construct interesting applications. In order to have interoperability between servers offering these building blocks (also known as Media Servers) and application developers, one needs to be able to locate and invoke such services in a well defined manner.
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