SIP Servlet 1.1
· This feature enables support for SIP Servlets written to the Java SipServlet 1.1 specification. The servlets can be packaged in Java EE specified WAR, SAR or EAR files. If servlet security is required, an appSecurity feature should also be configured; in the absence of a security feature any security constraints for the application will be ignored.
Download JD-GUI to open JAR file and explore Java source code file (.class .java)
Click menu "File → Open File..." or just drag-and-drop the JAR file in the JD-GUI window sipServlet-1.1-23.0.0.8.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.