%% You should probably cite rfc4189 instead of this I-D. @techreport{ietf-sipping-e2m-sec-reqs-06, number = {draft-ietf-sipping-e2m-sec-reqs-06}, type = {Internet-Draft}, institution = {Internet Engineering Task Force}, publisher = {Internet Engineering Task Force}, note = {Work in Progress}, url = {https://datatracker.ietf.org/doc/draft-ietf-sipping-e2m-sec-reqs/06/}, author = {Kumiko Ono and Shinya Tachimoto}, title = {{Requirements for End-to-Middle Security for the Session Initiation Protocol (SIP)}}, pagetotal = 12, year = 2005, month = mar, day = 16, abstract = {A Session Initiation Protocol (SIP) User Agent (UA) does not always trust all intermediaries in its request path to inspect its message bodies and/or headers contained in its message. The UA might want to protect the message bodies and/or headers from intermediaries, except those that provide services based on its content. This situation requires a mechanism called "end-to-middle security" to secure the information passed between the UA and intermediaries, which does not interfere with end-to-end security. This document defines a set of requirements for a mechanism to achieve end-to-middle security. This memo provides information for the Internet community.}, }