draft-ietf-sipcore-subnot-etags-01.txt   draft-ietf-sipcore-subnot-etags-02.txt 
Session Initiation Protocol A. Niemi Session Initiation Protocol A. Niemi
Working Group Nokia Working Group Nokia
Intended status: Standards Track Intended status: Standards Track
Expires: October 23, 2009 Expires: October 24, 2009
An Extension to Session Initiation Protocol (SIP) Events for Conditional An Extension to Session Initiation Protocol (SIP) Events for Conditional
Event Notification Event Notification
draft-ietf-sipcore-subnot-etags-01 draft-ietf-sipcore-subnot-etags-02
Status of this Memo Status of this Memo
This Internet-Draft is submitted to IETF in full conformance with the This Internet-Draft is submitted to IETF in full conformance with the
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Trust the right to allow modifications of such material outside the Trust the right to allow modifications of such material outside the
IETF Standards Process. Without obtaining an adequate license from IETF Standards Process. Without obtaining an adequate license from
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and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
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This Internet-Draft will expire on October 23, 2009. This Internet-Draft will expire on October 24, 2009.
Copyright Notice Copyright Notice
Copyright (c) 2009 IETF Trust and the persons identified as the Copyright (c) 2009 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents in effect on the date of Provisions Relating to IETF Documents in effect on the date of
publication of this document (http://trustee.ietf.org/license-info). publication of this document (http://trustee.ietf.org/license-info).
Please review these documents carefully, as they describe your rights Please review these documents carefully, as they describe your rights
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1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1. Document Conventions . . . . . . . . . . . . . . . . . . . 5 1.1. Document Conventions . . . . . . . . . . . . . . . . . . . 5
1.2. Terminology . . . . . . . . . . . . . . . . . . . . . . . 5 1.2. Terminology . . . . . . . . . . . . . . . . . . . . . . . 5
2. Motivations and Background . . . . . . . . . . . . . . . . . . 5 2. Motivations and Background . . . . . . . . . . . . . . . . . . 5
2.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2. Problem Description . . . . . . . . . . . . . . . . . . . 5 2.2. Problem Description . . . . . . . . . . . . . . . . . . . 5
2.3. Requirements . . . . . . . . . . . . . . . . . . . . . . . 7 2.3. Requirements . . . . . . . . . . . . . . . . . . . . . . . 7
3. Overview of Operation . . . . . . . . . . . . . . . . . . . . 7 3. Overview of Operation . . . . . . . . . . . . . . . . . . . . 7
4. Resource Model for Entity-Tags . . . . . . . . . . . . . . . . 11 4. Resource Model for Entity-Tags . . . . . . . . . . . . . . . . 11
5. Subscriber Behavior . . . . . . . . . . . . . . . . . . . . . 13 5. Subscriber Behavior . . . . . . . . . . . . . . . . . . . . . 13
5.1. Detecting Support for Conditional 5.1. Detecting Support for Conditional Notification . . . . . . 13
Notification . . . . . . . . . . . . . . . . . . . . . . . 13
5.2. Generating SUBSCRIBE Requests . . . . . . . . . . . . . . 14 5.2. Generating SUBSCRIBE Requests . . . . . . . . . . . . . . 14
5.3. Receiving NOTIFY Requests . . . . . . . . . . . . . . . . 15 5.3. Receiving NOTIFY Requests . . . . . . . . . . . . . . . . 15
5.4. Polling or Fetching Resource State . . . . . . . . . . . . 15 5.4. Polling or Fetching Resource State . . . . . . . . . . . . 15
5.5. Resuming a Subscription . . . . . . . . . . . . . . . . . 17 5.5. Resuming a Subscription . . . . . . . . . . . . . . . . . 17
5.6. Refreshing a Subscription . . . . . . . . . . . 18 5.6. Refreshing a Subscription . . . . . . . . . . . . . . . . 18
5.7. Terminating a Subscription . . . . . . . . . . . . . 18 5.7. Terminating a Subscription . . . . . . . . . . . . . . . . 18
5.8. Handling Transient Errors . . . . . . . . . . . . . . . . 19 5.8. Handling Transient Errors . . . . . . . . . . . . . . . . 19
6. Notifier Behavior . . . . . . . . . . . . . . . . . . . . . . 19 6. Notifier Behavior . . . . . . . . . . . . . . . . . . . . . . 19
6.1. Generating Entity-tags . . . . . . . . . . . . . . . . . . 20 6.1. Generating Entity-tags . . . . . . . . . . . . . . . . . . 20
6.2. Suppressing NOTIFY Bodies . . . . . . . . . . . . . . . . 20 6.2. Suppressing NOTIFY Bodies . . . . . . . . . . . . . . . . 20
6.3. Suppressing NOTIFY Requests . . . . . . . . . . 21 6.3. Suppressing NOTIFY Requests . . . . . . . . . . . . . . . 21
6.4. State Differentials . . . . . . . . . . . . . . . . . . . 21 6.4. State Differentials . . . . . . . . . . . . . . . . . . . 21
6.5. List Subscriptions . . . . . . . . . . . . . . . . . . . . 21 6.5. List Subscriptions . . . . . . . . . . . . . . . . . . . . 21
7. Protocol Element Definitions . . . . . . . . . . . . . . . . . 22 7. Protocol Element Definitions . . . . . . . . . . . . . . . . . 22
7.1. 204 (No Notification) Response Code . . . . . . . . . . . 22 7.1. 204 (No Notification) Response Code . . . . . . . . . . . 22
7.2. Suppress-If-Match Header Field . . . . . . . . . 22 7.2. Suppress-If-Match Header Field . . . . . . . . . . . . . . 22
7.3. Grammar . . . . . . . . . . . . . . . . . . . . . . . . . 22 7.3. Grammar . . . . . . . . . . . . . . . . . . . . . . . . . 22
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 23 8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 23
8.1. 204 (No Notification) Response Code . . . . . . . . . . . 23 8.1. 204 (No Notification) Response Code . . . . . . . . . . . 23
8.2. Suppress-If-Match Header Field . . . . . . . . . . . . . . 23 8.2. Suppress-If-Match Header Field . . . . . . . . . . . . . . 23
9. Security Considerations . . . . . . . . . . . . . . . . . . . 24 9. Security Considerations . . . . . . . . . . . . . . . . . . . 24
10. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 24 10. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 24
11. References . . . . . . . . . . . . . . . . . . . . . . . . . . 24 11. References . . . . . . . . . . . . . . . . . . . . . . . . . . 24
11.1. Normative References . . . . . . . . . . . . . . . . . . . 24 11.1. Normative References . . . . . . . . . . . . . . . . . . . 24
11.2. Informative References . . . . . . . . . . . . . . . . . . 25 11.2. Informative References . . . . . . . . . . . . . . . . . . 25
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 25 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 25
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RFC3903 [RFC3903]. RFC3903 [RFC3903].
Success =/ "204" ; No Notification Success =/ "204" ; No Notification
; Success is defined in RFC3261. ; Success is defined in RFC3261.
message-header =/ Suppress-If-Match message-header =/ Suppress-If-Match
; message-header is defined in RFC3261. ; message-header is defined in RFC3261.
Suppress-If-Match = "Suppress-If-Match:" ( entity-tag / "*" ) Suppress-If-Match = "Suppress-If-Match" HCOLON ( entity-tag / "*" )
; entity-tag is defined in RFC3903. ; entity-tag is defined in RFC3903.
8. IANA Considerations 8. IANA Considerations
This document registers a new response code and a new header field This document registers a new response code and a new header field
name. name.
Note to IANA and the RFC editor: please replace all occurrences of Note to IANA and the RFC editor: please replace all occurrences of
RFCXYZ in this section with the RFC number of this specification RFCXYZ in this section with the RFC number of this specification
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