Audio conferencing is a technology in which all participants dial into a central system that connects all parties instead of directly dialing each other.
Each desk telephone has the ability to conference up to 6 users. Dial-out only. Host must initiate all calls; if calls are long distance, normal charges apply. There is no cost (except long distance charges). There is no need to request this service, simply use the conference button on your phone.
You can also use Zoom as an audio bridge line.