Comment #5 on issue 2278 by jean.deruelle: the "branch" parameter in Via header duplicated in different SIP transaction
http://code.google.com/p/mobicents/issues/detail?id=2278
I would need the server.log at DEBUG level (your log is at INFO Level) to better investigate the case. You need to edit the log.xml and set org.mobicents (and gov.nist) category(ies) to DEBUG and start the container with -Djboss.server.log.threshold=DEBUG
