public Request createPrack(Response relResponse)
throws DialogDoesNotExistException, SipException {
if (this.getState() == null
|| this.getState().equals(DialogState.TERMINATED))
throw new DialogDoesNotExistException(
"Dialog not initialized or terminated");
if ((RSeq) relResponse.getHeader(RSeqHeader.NAME) == null) {
throw new SipException("Missing RSeq Header");
}