If an attendee prefers to join the audio portion of your meeting by Phone using the "attendee pin" this will tie their two connections together (phone & browser) and will identify them by their name used to join the viewer portion instead of appearing as their caller ID information in the participant list. This will allow the meeting to identify who's speaking or even control their speaking rights.

NOTE: The use of an attendee pin only applies if your plan has online meetings associated with it.