I guess you fly around Asia most of the time. When switched to Director in most parts of the world you can just check in with call sign only. Giving your life history when checking in just wastes their time. They are extremely busy ( that's why they have a Director) and only want to know you are on frequency. By looking at their radar they know your altitude, heading and speed so why give it to them all again. But there again most pilots like to hear their own voices