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draft elwell sipping redirection reason 01 n.
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draft-elwell-sipping-redirection-reason-01

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  1. draft-elwell-sipping-redirection-reason-01

  2. Motivation • Address 302 ambiguity issue • Additional information for UAC and UAS • Improved interworking with legacy

  3. Issues discussed on list • What is “normal rerouting”? • Probably need to remove this codepoint • Simply omit the Reason header if nothing particular to say about reason for redirection • How a Reason header in request or response relates to that request or response • More clarification needed

  4. Issues discussed on list (continued) • How it relates to History-Info • Was clarified on list • How to define values • Whether this is a sufficient list of values • Whether apps can do anything useful with the additional info • Not just for apps – also for display at UAS and UAC • Also for legacy interworking

  5. Issues discussed on list (continued) • Could Q.732 be used instead of inventing new namespace? • Use of Reason header in a response – is it allowed in RFC 3326? • Current text: “The Reason header field MAY appear in any request within a dialog, in any CANCEL request and in any response whose status code explicitly allows the presence of this header field.”

  6. Way forward • Three choices: • Do nothing • Define new extensible namespace along lines proposed in this draft • Define new namespace for Q.732 codepoints • In last two cases, define responses in which Reason header can be used in this way (e.g., 1xx, 2xx, 3xx) • In any case, may wish to permit existing Reason header in 3xx responses to solve only the 302 ambiguity problem