With the barge-in feature, you can drop in on an active call, essentially creating a three-way call. Use this tool to monitor or speak with a customer and agent at the same time.
Enter *33 on your phone.
If set up this way, you'll hear a tone letting you know that the system recognizes the access code.
Enter the phone number of the person whose call you want to barge in to.
When connected, you're in a three-way call.