I am currently looking at which API I should use within my business/website. Could you please confirm whether or not the webex API can provide the following features: 1. Can you join or host the webex API conference from a mobile or land line phone and via a website? Is there a different cost for computer to computer conferences? 2. Does the webex API have the option for screen sharing in its conferences? 3. Can you retrieve a time stamp and know when each of the members of a conference have joined and left etc? 4. Can you send text messages through the the webex API ?