We have been researching a good conference application. Do you have a favorite? We are thinking of downloading FreeConference.com You can take up to 200 callers, add video, and also invite international callers. And this is all free! Our friends have used it for sign language and so the video must be clear enough for that use. But because of that we haven't gotten a feed back on what the audio is like. It works with both iOS and Android devices and can be put on a mobile phone. Here is the link if anyone else wants to try it: Please Log In to view this link!