final String PARAM_SESSION_ID = 'session_id';
final String PARAM_CALL_TYPE = 'call_type';
final String PARAM_CALLER_ID = 'caller_id';
final String PARAM_CALLER_NAME = 'caller_name';
final String PARAM_CALL_OPPONENTS = 'call_opponents';
final String PARAM_IOS_VOIP = 'ios_voip';
final String PARAM_SIGNAL_TYPE = 'signal_type';
final String PARAM_EXPIRATION = 'expiration';

final String SIGNAL_TYPE_START_CALL = "startCall";
final String SIGNAL_TYPE_END_CALL = "endCall";
final String SIGNAL_TYPE_REJECT_CALL = "rejectCall";
