449     private final Map<String, Conference> mConferenceById = new ConcurrentHashMap<>();  field in ConnectionService
2325         mConferenceById.put(callId, conference);  in createConference()
2878         } else if (mConferenceById.containsKey(callId)) {  in handleExtrasChanged()
2887         } else if (mConferenceById.containsKey(callId)) {  in startRtt()
2896         } else if (mConferenceById.containsKey(callId)) {  in stopRtt()
2906         } else if (mConferenceById.containsKey(callId)) {  in handleRttUpgradeResponse()
3202         return mConferenceById.values();  in getAllConferences()
3716             mConferenceById.put(id, conference);  in addConferenceInternal()
3730             mConferenceById.remove(id);  in removeConference()
3754         if (mConferenceById.containsKey(conferenceId)) {  in findConferenceForAction()
3755             return mConferenceById.get(conferenceId);  in findConferenceForAction()