//join user endpoint with any of the announcement endpoint
ActivityContextInterface connectionActivity = sbbContext.getActivities()[0];
logger.info("Joining " + userEndpoint + " with " + ANNOUNCEMENT_ENDPOINT);
MsConnection connection = (MsConnection) connectionActivity.getActivity();
MsSession session = connection.getSession();
MsLink link = session.createLink(MsLink.MODE_FULL_DUPLEX);
ActivityContextInterface linkActivity = null;
try {
linkActivity = mediaAcif.getActivityContextInterface(link);
} catch (UnrecognizedActivityException ex) {