i just helped someone through a phone audio/thick client setup and realized the work flow for that type of setup is not that great. When configuring your webcam and audio settings there really needs to be a clickable option to use the phone instead of computer audio. You get this option when joining as a guest or joining using the meeting link but not when you join a meeting from the directory using the thick client. The thick client assumes that your default audio options are all computer based. It’s not a very uniform process. If there is a way to do this and I’m incorrect, pleas feel free to let me know.