Call Mixing

From Pbxnsip Wiki

One of the benefits of the PBX architecture is that existing calls can be interrupted and monitored.

All three modes, and especially the listen in mode, are severely affecting the privacy of the calls on the PBX. Therefore, those modes are only available to extensions that are specifically allowed to use those features. In the permissions tab of the respective extension, the domain or system administrator has to enable the features. Please consult corporation and government regulations if turning these features is allowed in your environment. Illegal listening to phone calls is a severe crime, and system administrators must be aware about that.

To see which calls are active, you can monitor the extension's state of the state of a CO-line. For example, you can do this by using the LED key of a SIP phone with the associated display.

Call Barge-In

In call barge in, two persons that are talking to each other are put into a kind of conference with a third person. Typically, this third person is a secretary reminding ("saving") the boss about another appointment. Both parties will hear the third person come into the call ("knock knock") and both parties will be able to hear what the third person has to say. The existence of the barge in call depends on the existence of the underlying conversation.

In order to barge into a call, dial *81 followed by the extension number that you would like to interrupt, then press dial.

Call Teach-Mode

In teach mode, only one side of the call can hear the third party. This is typically useful in a call center when a trainer wants to give tips to a new agent, so that the customer does not know about the teacher in the background. This mode is also sometimes called whisper mode, because the agent's phone must have a real good echo cancellation so that the customer does not hear some background echo.

In order to start the teach mode, dial *82 followed by the extension number that should hear your voice, and then press dial.

Call Listen-In

The listen mode is similar, but completely stealth mode. The two persons talking to each other are not notified about the listen in and cannot hear what the third person says on the phone (e.g. breathing).

In order to start listening to calls, dial *83 followed by the extension number that you would like to monitor.