The Simple Symmetric Transport Protocol (SSTP) is a TCP-based, message-oriented, application-layer binary protocol. It enables two higher-level applications to engage in bi-directional communication and to exchange data over multiple logical sessions on a single network connection.
Sections 1.8, 2, and 3 of this specification are normative and can contain the terms MAY, SHOULD, MUST, MUST NOT, and SHOULD NOT as defined in [RFC2119]. Sections 1.5 and 1.9 are also normative but do not contain those terms. All other sections and examples in this specification are informative.