You may hear a regular beeping tone during your call if you or one of your participants are calling in to the conference line from your cell phone or home phone, and have call waiting enabled. When you hear a tone notifying you that another call is coming through, that tone also plays into your conference call for all participants to hear. That is why we recommend turning off call waiting during your meeting.
Occasionally, you may also get a loud blaring sound into your phone. This is usually feedback caused by another electronic device like a Blackberry or laptop. If you get this noise, try moving away from those devices and the feedback should stop pretty quickly.
To find out from which line a disturbance is coming from, you can use the Online Meeting Room. This will enable you to view the call while it is in progress and you will be able to see where the disturbance is coming from, as that caller's tile will still be active (with a blue highlight around it) when no one is speaking. You can find out how to manage your calls from your computer at the following support page link: https://hello-support.freeconference.com/customer/en/portal/articles/2234977-managing-your-call-with-the-online-meeting-room
You can also moderate the call from your phone and block out disturbance from participants' lines by pressing *7 to mute all callers apart from the Moderator(s), or ask individual callers to mute their lines by pressing *6. You can read more about the conference controls available to you at the following link: https://hello-support.freeconference.com/customer/en/portal/articles/2158254-what-conference-controls-are-available-to-me-