java - TwilioAPIの「p1connected」と「インバウンドコール」の違いは何ですか

Question

TwilioAPIP1connectedとの違いを知りたいです。InboundCall

switch (requestedop){
            case P1Connected:
                output = //calling a method
                break;
            case P2Connected:
                output = //calling a method
                break;
            case EndCall:
                output = //calling a method
                break;
            case TranscribeCallBack:
                output = //calling a method
                break;
            case InboundCall:
                output =//calling a method
                break;
            case InboundCallForward:
                output = //calling a method
                break;  
            case InboundSms:
                output = //calling a method
                break;
            case FallBack:
                output = //calling a method
                break;
            case MissedCall:
                output = //calling a method
                break;
            default:
                throw new ServletException ("Operation not supported.");
        }

私はそれをグーグルで検索しましたが、正確な違いは見つかりませんでした。