Hi there
I am developing an application that is SIP based , using UDP socket supported by the Java, the application is client /server,
what package do I need so I can send SIP message with in the socket I have created,

in other word the application looks like the an audio application , the signaling part I want to use is the SIP protocol, thus the socket sends SIP message such as INVITE ( which I think that there is an API in the java allow creation simply) , I have searched the net , I am developing an application thus do not want to use the servlet,
please any ideas for the packages I need, I've heard that there are a package I should download but do not have the name of it

I hope I made self clear,

thanks in advance