Other header fields

Other header fields

  • Content-Encoding:
  • Allow:
  • Expires:
  • In-Reply-To:
  • Priority: indicated priority of displaying a message to sender
    • Normal
    • Urgent
    • Non-Urgent
    • Emergency
  • Require: contains a list of options which the server is expected to support in order to process a request
  • Retry after: number of seconds after which a requestor should try again
  • Supported: enumerates all the extensions supported the sender (NB: this differs from a “Require” which requires that a destination supports the given extension)
  • Session-ID: globally unique session identifier for the same SIP session used end-to-end m(i.e., maintained across SIP Proxies, Back-to-Back User Agents (B2BUAs), and other SIP middleboxes) – see RFC 7329.

Slide Notes

Hadriel Kaplan, A Session Identifier for the Session Initiation Protocol (SIP), Internet Engineering Task Force (IETF), ISSN: 2070-1721, Request for Comments 7329, August 2014 https://datatracker.ietf.org/doc/rfc7329/

Transcript

[slide137] And we can add all kinds of other headers, like priorities, et cetera.