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.

SIP and SIP servlets are also important in the enterprise. Combined with Java EE technology, SIP servlets can be used to add rich media interactions to enterprise applications.

The OpenStage phones also support third-party applications through standards-based technologies such as Java, HTML, WML and XML.