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The SIP Servlet Specification (Java Specification Request 116), developed through the Java Community Process, provides a standard Java API programming model for delivering SIP-based services.
As an API, RMI enables client and server communications over the internet, allowing for client programs to send requests to a server program and the server program to respond appropriately to incoming ...
Unlike client-server, the three-tier application model has aged quite gracefully and is now used to provide API services in addition to web pages.