If you plan to have an audio-only conference, you can use Zoom. It's usually used for video/web conferencing, but can easily be adapted to audio-only use.
There are two ways to use Zoom for audio only:
With your OSU Zoom account, you get a personal phone and meeting number you can use anytime!
The benefit is that this number stays the same and doesn't require scheduling a meeting. The downside is that you have to enter a host key to start the meeting, and the meeting can't start without this key.
To use your Personal Audio Conference:
The host key, listed at the bottom of the page, can be customized in your Profile page if you want an easier-to-remember number. Visit Zoom FAQ for help with changing your pin.
Additional Personal Audio Conference Information: Getting Started With Personal Audio Conference.
Another method is to schedule a Zoom meeting and only share the audio information in your calendar invite.
The benefit is that nobody has to enter a host key, so this is good for meetings that don't have a set list of participants (or in which the host is always running late.) It's also an option if you're setting up meetings on others' behalf and want your Personal Audio Conference line to be available for another use at the same time. The downside is that you have to schedule the meeting, which takes more typing, and you can't prevent people from joining before the host is ready.
It's very important that Enable Join before Host is checked for your meeting. Otherwise, it's not possible to start the meeting using phones only.