Comment #8 on issue 2354 by jean.deruelle: B2buaHelper.createResponseToOriginalRequest() does not set different To tag to created response.
http://code.google.com/p/mobicents/issues/detail?id=2354
JAIN SIP doesn't seem to allow us to handle it neither, seeking advice on their mailing list http://java.net/projects/jsip/lists/users/archive/2011-04/message/0
