＆＃39; p1connected＆＃39;有什么区别？和＆＃39;入站电话＆＃39;在Twilio API中

Question

我想了解Twilio API中P1connected和InboundCall之间的区别。

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.");
        }

我用谷歌搜索它，但它没有找到它的确切区别。