params.put("VoiceUrl", "http://demo.twilio.com/welcome/voice/");
mainAccount.getIncomingPhoneNumberFactory().create(params);
// View a conference using it's sid
Conference c = mainAccount.getConference("CA12345...");
ParticipantList participants = c.getParticipants();
for (Participant p : participants) {
// Randomly mute or kick each participant
if (Math.random() > 0.5) {
p.mute();