There are several things elements of teleconference etiquette, please review these before you call. Use your telephone's mute button, if there is one. Background noise, the dog barking, radio, etc., could be a problem for the other participants. If you don't have a mute button, don't worry. Just try to call from a quiet location.
Some people breathe 'heavier' than others.
Most of the heavy breathers don't realize it. So, we ask everyone to hold the mouthpiece or telephone headset microphone a bit away from their mouth and nose, unless they are speaking. If you have a two-line phone, please turn the ringer off of the second line. If you don't, and you get a call during the TeleClass, it can really be a shrill noise that everyone hears. Please don't use them, unless you use the mute button.