What does it cost? There is NO set-up fee or monthly fee for Conference Center. You save 50% or more per-minute, per-caller for conference calls of 3-8 participants (includes call initiator if in continental U.S.) over operator-assisted calls from AT&T, MCI and Sprint Charges are billed to your credit card, and you received a detailed statement via e-mail. Or, traditional net 30 invoicing is available upon approved credit.