When using Zoom, there are charges incurred for toll-free phone calls, as well as charges for “Call Me” callback calls. The cost is roughly 8 cents a minute per attendee who dials in.  The Zoom usage per account will be broken down and charg back the audio overages to the project code/cost center associated with your account.

There are several ways to limit your cost:

1. Use VoIP: Join the audio conference using computer audio.  When combined with a headset or a USB speaker, the call quality is as good or better than dialing-in.  This has been tested repeatedly and the quality of the computer audio on Zoom is noticeably better than the computer audio on Skype for Business.  So, don’t let a negative experience in the past discourage you from using VoIP. (And be sure to encourage your attendees to do the same!)
2. Dial toll numbers: Dialing into a meeting using in-country toll numbers (instead of toll-free) does not incur any charge. So if you do feel the need to join by phone, this is the best way to do so.
3. Hide toll-free numbers from your meeting invite: Log into your Zoom account on the web (https://path.zoom.us) and go to My Meeting Settings on the left. Click on the “Telephone” tab, and then click on the pencil under “Global Dial In Countries” to select which numbers appear in your invites by default. You can uncheck the toll free numbers at the bottom. This will not prevent someone from dialing the toll free number if they know it, but it will prevent it from showing up in your meeting invite.