On the standards track: Yes
Is Experimental: No
Is Deprecated: No
In Chrome version 56 on 2017-01-25 Note: Before Chrome 63, the default value for the configuration.rtcpMuxPolicy parameter is "negotiate" instead of "required".
In Chrome Android version 56 on 2017-02-01 Note: Before Chrome Android 63, the default value for the configuration.rtcpMuxPolicy parameter is "negotiate" instead of "required".
In Edge version 15 on 2017-04-05
In Firefox version 44 on 2016-01-26
In Firefox for Android version 44 on 2016-01-26
Not in Internet Explorer
In Quest Browser version 5.0 on undefined Note: Before Quest Browser 5.0, the default value for the configuration.rtcpMuxPolicy parameter is "negotiate" instead of "required".
In Opera version 43 on 2017-02-07 Note: Before Opera 50, the default value for the configuration.rtcpMuxPolicy parameter is "negotiate" instead of "required".
In Opera Android version 43 on 2017-09-27 Note: Before Opera Android 46, the default value for the configuration.rtcpMuxPolicy parameter is "negotiate" instead of "required".
In Safari version 11 on 2017-09-19
In Safari on iOS version 11 on 2017-09-19
In Samsung Internet version 6.0 on 2017-08-23 Note: Before Samsung Internet 8.0, the default value for the configuration.rtcpMuxPolicy parameter is "negotiate" instead of "required".
In WebView Android version 56 on 2017-02-01 Note: Before WebView Android 63, the default value for the configuration.rtcpMuxPolicy parameter is "negotiate" instead of "required".
In WebView on iOS version 11 on 2017-09-19