I received an abusive fraudulent phone call today from someone from the "Windows security service" who no doubt wanted to get me to install malware on my computer. The call made once again think of our need for "secure origin identification" within IP communications. More info at:

http://www.circleid.com/posts/20130729_can_we_create_a_secure_caller_id_for_voip/

http://datatracker.ietf.org/wg/stir/charter/