Click the 
icon on the media player.
Follow the dialing and passcode (if necessary) instructions.
If you prefer to listen to a webcast on the phone, you can use a telephone number given to you by the presentation organizers to listen and interact with the speakers. Some companies offer the audience a chance to ask questions during a live webcast. Your question will be answered by the speaker and be heard by the phone and online audience.
To call the phone number for a webcast:
Click the icon on the media player.
Follow the dialing and passcode (if necessary) instructions.
The phone option will only work if the icon is available on the media player.