Develop SIP applications
A SIP application is a set of SIP servlets packaged in a SIP application archive file (SAR).
A SIP servlet is an application component managed by the SIP container that performs SIP signaling. The programming and deployment models are analogous to Web servlets and therefore will be mapped to the WebSphere administrative model accordingly. It is possible to include Web servlets in a SAR file (along with the required web.xml deployment descriptor) to create what is known as a converged application. See JSR 116 for details on SIP applications, servlets, converged applications, and status codes.
Develop a custom trust association interceptor
Develop SIP applications that support PRACK
Set up SIP application composition
SIP servlets 
Related concepts
SIP IBM Rational Application Developer for WebSphere framework
Related tasks
Browse all SIP topics
Related
SIP industry standards compliance
Runtime considerations for SIP application developers