Update Issue 28
(git-repo)

http://java.net/jira/browse/JSIP-444

(master) Fix regressions on testsuite and NPE discovered in logs of testsuite
(cherry picked from commit 87e87b993e98abeea06523cec64b74f96c34c557)

Conflicts:
	src/gov/nist/javax/sip/stack/SIPDialog.java

git-svn-id: https://svn.java.net/svn/jsip~svn/trunk@2271 8e71dc83-d81e-6649-80f2-80b843a9b2be
Bug 622: No media due to JSIP sending repeated ACK

The ACKs were dropped because CSeq numbers got out of order.  Fix is to prevent this from happening by preventing CSeq numbers from ever decreasing