{
  "draft": "draft-ietf-sipping-e2m-sec-reqs-06",
  "doc_id": "RFC4189",
  "title": "Requirements for End-to-Middle Security for the Session Initiation Protocol (SIP)",
  "authors": [
    "K. Ono",
    "S. Tachimoto"
  ],
  "format": [
    "TEXT",
    "HTML"
  ],
  "page_count": "12",
  "pub_status": "INFORMATIONAL",
  "status": "INFORMATIONAL",
  "source": "Session Initiation Proposal Investigation",
  "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.",
  "pub_date": "October 2005",
  "keywords": [
    "user agent",
    "ua",
    "intermediaries"
  ],
  "obsoletes": [],
  "obsoleted_by": [],
  "updates": [],
  "updated_by": [],
  "see_also": [],
  "doi": "10.17487/RFC4189",
  "errata_url": null
}