Merge "Implement DTMF tones in test RemoteConference" into lmp-dev

                mRemote.unregisterCallback(mRemoteCallback);

                mManagedConferenceByRemote.remove(mRemote);

            }

        };

        @Override

        public void onPlayDtmfTone(char c) {

            mRemote.playDtmfTone(c);

        };

        @Override

        public void onStopDtmfTone() {

            mRemote.stopDtmfTone();

        };

        private final RemoteConference mRemote;