Hello, sorry to respond late, I was out yesterday.
Yes, the above link is indeed what we're looking for. However, we're looking to do this in a call manager environment.
If a line is shared and added to two phones. Can one person pick up, get dialtone and make a call? Then the coach open the line on his phone and listen, hitting mute. This way there is no interference?
This tone-playing capability is also limited to the controlling device capability. Only those device types that have a built-in bridge (such as Cisco IP phone models 7940, 7960 and newer) can play a tone to all parties.
When the controlling device is no longer present in the call or lacks the capability, the tone is played to all parties, even if this parameter is True. Valid values are True (play tone) or False (do not play tone). This is a required field. The default value is True.
Barge Using Built-In Conference-Barge Softkey
You can use the Barge softkey only in the remote-in-use call state. A built-in conference bridge proves advantageous because neither a media interruption nor display changes to the original call occur when the barge is being set up. A spinning circle displays at the right side of the prompt status message window at the target device.