Allows a user to barge into a conversation. The barging user is the extension specified in the user parameter. The barging user will be able to choose whether to listen or speak to the participants in the conversation.
tenant – tenant name
user – the extension of the user who is barging into the conversation
tid – an integer; the talker ID of one of the users whose conversation is barged into
listen – true or false
speak – true, false, or tutor
A success message or an error message.