In the Admin Portal, if you're enabled, you should see Groups on the Left under the Phone System tab. There should be a second menu in there for Call Monitoring. You'd setup your users to monitor and who can be monitored there. When they want to monitor the trainee, just dial *80 and then the extension to monitor. This can be done from a desk phone, soft phone or the mobile app. The Trainee and the other party do not hear you. *81 will allow whisper coaching and *82 will allow barging into the call.
The end users get notification when this feature is turned on or off.
read more hear.
https://support.ringcentral.com/s/article/8086
