https://telestax.com/mobicents-sip-servlets-sip-programming-in-java-tutorial/
http://www.javaworld.com/article/2071781/java-web-development/sip-programming-for-the-java-developer.html
http://alex.bikfalvi.com/teaching/upf/2013/architecture_and_signaling/lab/sip/
http://stackoverflow.com/questions/13033116/jain-sip-authentication
https://andrewjprokop.wordpress.com/2015/03/17/a-deep-dive-into-the-sip-publish-method/
http://www.oracle.com/technetwork/java/sip-and-java-137921.html
http://stackoverflow.com/questions/26551606/difference-between-jain-api-and-jain-slee-api
http://www.phitech.com.tw/news/?news_id=709
https://sourceforge.net/projects/mcumediaserver/?source=recommended
Open source SIP product
http://peers.sourceforge.net/
https://code.google.com/archive/p/sip2peer/wikis/sip2peerTutorial.wiki
https://maven.reucon.com/projects/public/asterisk-java/1.0.0/tutorial.html
http://www.asteriskguru.com/tutorials/basic_installation_information_asterisk_from_source.html
http://www.mobicents.org/index.html
https://developer.jboss.org/wiki/HelloSLEEWorldServiceJAINSLEETutorial
WebRTC media server
http://doc-kurento.readthedocs.org/en/stable/what_is_kurento.html
http://www.html5rocks.com/en/tutorials/webrtc/infrastructure/
HTML5 SIP client
https://www.doubango.org/sipml5/
Audio Library
http://stackoverflow.com/questions/8999629/open-source-audio-library-in-java
Asterisk V.S. Kamailio
http://www.dslreports.com/forum/r29128751-Kamailio-vs-Asterisk
http://kb.asipto.com/kamailio:presence:k31-made-simple
Xcap
http://nil.uniza.sk/instant-messaging/simple/configuring-xcap-support-im-and-presence-over-kamailio-31-debian-lenny
http://openxcap.org/
Presence Server
http://www.opensips.org/Documentation/Tutorials-Presence-PresenceServer
Back-to-back-user-agent (b2bua)
https://andrewjprokop.wordpress.com/2013/12/27/the-back-to-back-user-agent-b2bua/
https://andrewjprokop.wordpress.com/2013/06/21/sip-servers-and-services/
SIPS & SRTP
http://wiki.linuxwall.info/doku.php/en:ressources:dossiers:voip:tls_sips_rtps
