447     private final Map<String, Conference> mConferenceById = new ConcurrentHashMap<>();  field in ConnectionService
2323         mConferenceById.put(callId, conference);  in createConference()
2876         } else if (mConferenceById.containsKey(callId)) {  in handleExtrasChanged()
2885         } else if (mConferenceById.containsKey(callId)) {  in startRtt()
2894         } else if (mConferenceById.containsKey(callId)) {  in stopRtt()
2904         } else if (mConferenceById.containsKey(callId)) {  in handleRttUpgradeResponse()
3200         return mConferenceById.values();  in getAllConferences()
3714             mConferenceById.put(id, conference);  in addConferenceInternal()
3728             mConferenceById.remove(id);  in removeConference()
3752         if (mConferenceById.containsKey(conferenceId)) {  in findConferenceForAction()
3753             return mConferenceById.get(conferenceId);  in findConferenceForAction()