This document describes an option for negotiating the use of header compression on IP datagrams transmitted over the Point-to-Point Protocol (RFC 1661). It defines extensions to the PPP Control Protocols for IPv4 and IPv6 (RFC 1332@ RFC 2472). Header compression may be applied to IPv4 and IPv6 datagrams in combination with TCP@ UDP and RTP transport protocols as specified in RFC 2507@ RFC 2508 and RFC 3545.