Opporeno5 opened the video and there was an echo.

If you are using an OPPO mobile phone (ColorOS system), if there is an echo when you encounter a cross-end call, please confirm whether your computer uses a Realtek Audio sound card: right-click My Computer > Click Management > Click Device Management > Click Audio, Video and Game Controller to see if there is any information about the Realtek Audio sound card.

If the computer is using a Realtek Audio sound card, please try to turn on the switch of echo cancellation function in the Realtek audio console settings. Realtek audio console application can be downloaded through official channels.