Mobicents provide Jboss and tomcat applications servers with additional modules which are required to deploy and run your sipservlet application
if you download and extract the jboss distribution you can see there are some modules call sip-presence,sip-balancer , mobicents-media-server-1.0.3.GA.sar in deploy folder these are few and you will find a lot of additional modules/resources.
What you have to do is download the jboss from here and deploy your sipservlet war file as a normal web deployment.