class C {
  // RTCSession states.
  static const int STATUS_NULL = 0;
  static const int STATUS_INVITE_SENT = 1;
  static const int STATUS_1XX_RECEIVED = 2;
  static const int STATUS_INVITE_RECEIVED = 3;
  static const int STATUS_WAITING_FOR_ANSWER = 4;
  static const int STATUS_ANSWERED = 5;
  static const int STATUS_WAITING_FOR_ACK = 6;
  static const int STATUS_CANCELED = 7;
  static const int STATUS_TERMINATED = 8;
  static const int STATUS_CONFIRMED = 9;
}

enum RtcSessionState {
  none, // STATUS_NULL
  inviteSent, // STATUS_INVITE_SENT
  provisionalResponse, // STATUS_1XX_RECEIVED
  inviteReceived, // STATUS_INVITE_RECEIVED
  waitingForAnswer, // STATUS_WAITING_FOR_ANSWER
  answered, // STATUS_ANSWERED
  waitingForAck, // STATUS_WAITING_FOR_ACK
  canceled, // STATUS_CANCELED
  terminated, // STATUS_TERMINATED
  confirmed, // STATUS_CONFIRMED
}