SIP stack is process&Library for dealing with SIP.(Sessin Initiation Protocol)
Open Source SIP Stack for JAVA:
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1) PJSIP-JNI which is java bindings for the C PJSIP library
2) JAIN-SIP http://users.cis.fiu.edu/~ege/JAIN/
https://github.com/Mobicents/jain-sip
https://jsip.ci.cloudbees.com/job/jsip/javadoc/
http://www.oracle.com/technetwork/java/introduction-jain-sip-090386.html (Oracle introduction)
https://developer.opencloud.com/devportal/devportal/apis/jainsip/1.1/docs/index.html
http://www.worldlibrary.org/articles/mobicents
http://www.mobicents.org/products.html
RFC 3261 functionality and the following SIP extensions; the INFO method (RFC 2976), Reliability of provisional responses (RFC 3262), Event Notification Framework (RFC 3265), the UPDATE method (RFC 3311), the Reason Header (RFC 3326), the Message method (RFC 3428) defined for instant messaging and the REFER method (RFC 3515), Distributing Authoritative Name Servers via Shared Unicast Addresses (RFC 3581), the PUBLISH method (RFC3903).
SDP API(JSR 141) is property of Dynamic Soft. => under JCP License
3) MjSip http://www.mjsip.org
4) javaforce http://sourceforge.net/projects/javaforce/
5) jSIP http://jsip.java.net http://jsip.sourceforge.net/
6) openjsip http://code.google.com/p/openjsip/
SIP Stack for C
1) reSIPRocate http://www.resiprocate.org, http://svn.resiprocate.org/dox/
2) Spirent IMS SIP stack = Radvision SIP Stack. REF-SITE
- (Avaya m&a Radvision(2012), spirent m&a Radvision Tech Biz Unit(2014) )