index.js

async acceptCall() {
          const tokenRes = await this.generateToken(this.agoraChannel);
          this.initializeAgora(tokenRes.data.appID);
    
          this.joinRoom(tokenRes.data.token, this.agoraChannel);
          this.incomingCall = false;
          this.callPlaced = true;
        },
    
        declineCall() {
          // You can send a request to the caller to
          // alert them of rejected call
          this.incomingCall = false;
        },

Now my problem is when call has been declined, the caller could not get alert