Call whispering is a feature in which you can call within the call and it helps the admin to keep a check on the staff since it helps the person to rectify with the information or even train the caller who is trying to solve the query.
Call whisper, otherwise known as call screening, is a calling feature that often appears on non-geographic telephony systems and hosted inbound call handling software.
Using this service manager can listen to the conversation between the caller and agent and give feedback to the agent where required. Such feedbacks are only listened by agents they are muted from the caller. This helps us in preventing any wrong information delivery to the caller.