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.

Learn how Remote Method Invocation (RMI), an application programming interface for Java, preserves the object model and its advantages across a network.

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.