on a test number: <span class="baec5a81-e4d6-4674-97f3-e9220f0136c1" style="white-space: nowrap;">949-629-3539
</span> we added a conference room to an AnswerCall and then put a pin of 1234.
After 3 successfull connections to the conference room, it started to give another test 3 callers a busy signal.
So basically we could get 3 participants.