from the website...
"We made CCALL because it’s a pain in the axx to enter conference codes from a mobile phone. If you've ever had a calendar invite with a long conference ID and scribbled it on the back of your hand to avoid jumping between the email, your calendar and your phone app then you understand why we did this."
Question: Do you think this a clever public service, or a clever social engineering eavesdropping / espionage trick? Doesn't matter. I know what I am telling my clients.