The vgspe 2.1 pro is an award-winning next generation voip security phone adapter based on industry open standards.\n\nwith built in our unique vgcp voip anti-blocking solution, the core patent-pending vgcp is industryâ? s most state-of-the-art voice service provider class security protocol whose scalability and flexibility results in not to compromise voice quality and overhead. \n\nit can disguises sip and rtp packets into normal allowed data packets such as dns and tftp and makes two-way encryption and decryption driven by user-customized policy.