It seems like you might be referring to PTTP (Priority Trunking Protocol), which is a VPN protocol used in certain internet service providers (ISPs) to prioritize certain types of traffic. PTTP allows users to direct traffic to specific services, such as online banking, entertainment, or specific websites, while blocking other traffic. This is useful for ISPs to manage their traffic load and provide better service to their customers. If you're referring to a different protocol, such as PPTV (Priority Packet Tracing Video) or PPTP (Priority Packet Tracing), you might be talking about a custom or specialized protocol. If you're looking to learn more about a specific VPN protocol, feel free to provide more details, and I can help guide you on how to find the information you need.