I couldn't find that method.
Below are the methods that i get.
multiUserChat.addInvitationRejectionListener()
multiUserChat.addMessageListener()
multiUserChat.addParticipantListener()
multiUserChat.addParticipantStatusListener()
multiUserChat.addPresenceInterceptor()
multiUserChat.addSubjectUpdatedListener()
multiUserChat.addUserStatusListener()
Any idea?