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Update on .SUBSCRIBE/NOTIFY: Changes and Future Work

This document outlines the changes made to the .SUBSCRIBE/NOTIFY protocol since the last draft, including the disallowance of multiple contacts per SUBSCRIBE message and the requirement of a contact header in NOTIFY messages. It also covers the removal of distinctions between third-party/call member events and call-related/resource-related events. The document discusses the expectation of NOTIFY messages before the SUBSCRIBE transaction completes and the addition of an immediate NOTIFY message after a successful SUBSCRIBE. It also addresses the concept of "undefined state" before a NOTIFY arrives and provides a mechanism for notifiers to shorten or cancel outstanding subscriptions. The document removes all discussion of out-of-band subscriptions and includes a brief discussion of event state polling. Open issues, future work, and possible working group items are mentioned.

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Update on .SUBSCRIBE/NOTIFY: Changes and Future Work

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  1. SUBSCRIBE/NOTIFY 49th IETF San Diego, CA 12/12/2000 Adam.Roach@Ericsson.com

  2. Changes since last draft • Multiple contacts per SUBSCRIBE message disallowed. • Contact header now required in NOTIFY messages. • Distinction between third party/call member events removed. • Distinction between call-related/resource-related events removed. • Clarified that subscribers must expect NOTIFY messages before the SUBSCRIBE transaction completes. • Added immediate NOTIFY message after successful SUBSCRIBE. • Added discussion of “undefined state” (before a NOTIFY arrives). • Added mechanism for notifiers to shorten/cancel outstanding subscriptions. • Removed all discussion of out-of-band subscriptions. • Added brief discussion of event state polling.

  3. Open Issues • Event Agents • Generic Event Throttling Mechanism

  4. Future Work • Working group item? • Formal BOF?

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