I need to work currently in sipservlets using sailfin. I have run successfully the clicktodial sample program given in the sailfin link. But I find hard to develop my own coding. I know servlets and JSP and I have worked on it.But to do sipservlets Whether i need to know any other java technologies other than servlets and jsp?
I'm not sure I understand what you're asking. You said that you "need to work in SIP servlets", so I guess you have requirements that demand the use of SIP? If so, what difficulty are you facing in implementing those requirements? Are you familiar with SIP, its typical use cases, and how to apply SIP to solving them?
I don't think JSPs play much, if any, role when it comes to SIP, except maybe for a web app that serves as a front end for setting parameters or options that the SIP app should take into account.