Does your Adobe Connect Meeting have phone (audio) conferencing?
When you log in as a “registered user” to an Adobe Connect meeting that you are hosting, you may find a telephone icon instead of a microphone icon. That signals that the meeting has been set up for audio conferencing so that remote attendees can use their telephones to enter the dialogue. If you have not set up audio conferencing yourself, follow the guideline shown in this 35 second screencast.
To set up audio conferencing yourself as a host, follow these instructions.