How Do I Change from a Voice Call to a Video Call?
To change from a voice call to a video call:
While in your voice call, click the video icon. See How Do I Initiate Video Calls? You do not need to end the voice call to transfer to the video call unless you are calling new buddies.
You can perform this function in multi-party voice and video calls as well.
In a multi-party voice call where you upgrade to a video call, the voice call might be disconnected if any of your buddies declines the upgrade request to the video call.
You can perform screen sharing both in voice and in video calls.