Fix for https://java.net/jira/browse/JSIP-384 non-200 response in nested transaction.

git-svn-id: https://svn.java.net/svn/jsip~svn@2354 8e71dc83-d81e-6649-80f2-80b843a9b2be
Fixes for https://java.net/jira/browse/JSIP-485

git-svn-id: https://svn.java.net/svn/jsip~svn@2355 8e71dc83-d81e-6649-80f2-80b843a9b2be