There are several protocols to be on a TeleClass. Use your telephone's mute button, if there is one. Background noise, the dog barking, radio, etc., can make it hard for other callers to hear. If you don't have a mute button, not to worry. Just try to call from a quiet location.
Some people breathe 'heavier' than others.
And 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. Speakerphones, Cell phones and Cordless phones.