Remote Access to Android Phone from Desktop using 3CX Remote Android App through USB.

Steps :- 

Root your phone. [Optional]

Install  3CX DroidDesktop / 3CX Remote Android Desktop [For using all features of this app, rooting your Android is necessary.]

Download ADB(Android Debug Bridge)  from here.

Extract ADB. 

Connect Phone to PC through USB 

Enable USB debugging.

Open CMD and cd to the extracted folder of ADB where adb.exe is present. 

Execute command > adb.exe forward tcp:5991 tcp:5991

Set 5991 as port in the app Settings > Port:

Start Server

Open Browser and open URL : http://localhost:5991   

3CX Android view should open, click on Remote Control. It will ask to allow root access in Phone, allow it. 

Now the app is in root mode, and all feature will work.