There are 2 functions of the Listen Live - Listen and Barge.
In the detail page you can select from the drop down list users (extensions) who may and user who may not:
- Listen only
- Barge only
- Listen and Barge
The enabled users access this functionality by dialing a * code and the extension:
Listen:
Dial *57 + an extension number to listen in on a conversation.
You will not be able to talk to either party.
Barge
Dial *58 + an extension number to barge in on a call.
You will be able to speak to the extension that you dialed.
The party(ies) on the other end of the conversation will not hear your audio when you barge, only the user at the extension you are barging on.
Below the permissions panes there is a list of users who may be listened to. This functionality is typically used for quality assurance by listening to call center agents, etc., and naturally the CEO is not going to want anyone listening on their calls, so customers would disable listening for those desired extensions.
The final caveat is that you must conform to State law regarding informing users (both callers and employees) that their conversations may be recorded.