New features includes

• CDI integration with our new framework : Converged CDI Telco Framework (CTF)
• Better Servlet 3.0 integration : Converged Click2Call Async Servlet 3.0 application leverages the new Async (Server Push) features from the Servlet 3.0 specification integrated to the Sip Servlets specification

More information in the release announcement here

For those who (like me) don't know SIP:

"The Session Initiation Protocol (SIP) is used to establish, modify, and tear down multimedia IP sessions including IP telephony, presence, and instant messaging. An important aspect of any communication infrastructure is programmability and the purpose of the SIP Servlet API is to standardize the platform for delivering SIP based services. The term platform is used here to include the Java API itself as well as standards covering the packaging and deployment of applications."

SIP Servlet API Specification: http://www.wesip.com/mediawiki/API/sipservlet-1.0-fcs.pdf

 

SIP Servlet API Specification: http://www.wesip.com/mediawiki/API/sipservlet-1.0-fcs.pdf

 

You're linking to the old spec, here is the new (3y old) spec :

http://jcp.org/en/jsr/detail?id=289