The U.S. Patent and Trademark Office published a Microsoft patent application that reaches back to December 2009 and describes ‘recording agents’ to legally intercept VoIP phone calls. The ‘Legal Intercept‘ patent application is one of Microsoft’s more elaborate and detailed patent papers, which is comprehensive enough to make you think twice about the use of VoIP audio and video communications. The document provides Microsoft’s idea about the nature, positioning and feature set of recording agents that silently record the communication between two or more parties.