muteUnmuteParticipant: function (participant, isToBeMuted) {

          

            if(isToBeMuted) {

                if (participant && participant.getMuteParticipantAudioCapability()) {

                    this.participant.mute().then(function () { 

                        console.log("Success mute participant");

                    }, function () { 

                        console.log("Failed mute participant");

                    }); 

                }         

            }else{

                if (participant && participant.getUnmuteParticipantAudioCapability()) {

                    this.participant.unmute().then(function () { 

                       console.log("Success unmute participant");

                    }, function () { 

                     console.log("Failed unmute participant");

                    }); 

                }     

            }

        }