The Fax Server and Client Remote Protocol Specification defines a protocol that is referred to as the Fax Server and Client Remote Protocol. This is a client/server protocol based on remote procedure call (RPC) that is used to send faxes and manage the fax server and its queues.
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.