• string : RingCentral.AccountPresenceEvent , RingCentral.AccountTelephonySessionsEvent , RingCentral.CallQueuePresenceEvent , RingCentral.DetailedExtensionPresenceEvent , RingCentral.DetailedExtensionPresenceWithSIPEvent , RingCentral.ExtensionFavoritesEvent , RingCentral.ExtensionGrantListEvent , RingCentral.ExtensionInfoEvent , RingCentral.ExtensionListEvent , RingCentral.ExtensionPresenceEvent , RingCentral.ExtensionTelephonySessionsEvent , RingCentral.IncomingCallEvent , RingCentral.InstantMessageEvent , RingCentral.MessageEvent , RingCentral.MissedCallEvent , RingCentral.VoicemailMessageEvent