draft-ietf-bliss-problem-statement-03.txt		draft-ietf-bliss-problem-statement-04.txt
	BLISS J. Rosenberg		BLISS J. Rosenberg
	Internet-Draft Cisco		Internet-Draft Cisco
	Intended status: Informational November 3, 2008		Intended status: Informational March 9, 2009
	Expires: May 7, 2009		Expires: September 10, 2009
	Basic Level of Interoperability for Session Initiation Protocol (SIP)		Basic Level of Interoperability for Session Initiation Protocol (SIP)
	Services (BLISS) Problem Statement		Services (BLISS) Problem Statement
	draft-ietf-bliss-problem-statement-03		draft-ietf-bliss-problem-statement-04
	Status of this Memo		Status of this Memo
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	Copyright Notice		Copyright Notice
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	Abstract		Abstract
	The Session Initiation Protocol (SIP) has been designed as a general		The Session Initiation Protocol (SIP) has been designed as a general
	purpose protocol for establishing and managing multimedia sessions.		purpose protocol for establishing and managing multimedia sessions.
	It provides many core functions and extensions in support of features		It provides many core functions and extensions in support of features
	such as transferring of calls, parking calls, and so on. However,		such as transferring of calls, parking calls, and so on. However,
	interoperability of more advanced features between different vendors		interoperability of more advanced features between different vendors
	has been poor. This document describes the reason behind these		has been poor. This document describes the reason behind these
	interoperability problems, and presents a framework for addressing		interoperability problems, and presents a framework for addressing
	them.		them.
	Table of Contents		Table of Contents
	1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3		1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4
	2. The Confusion of Tongues . . . . . . . . . . . . . . . . . . . 4		2. The Confusion of Tongues . . . . . . . . . . . . . . . . . . . 5
	3. Concrete Examples . . . . . . . . . . . . . . . . . . . . . . 5		3. Concrete Examples . . . . . . . . . . . . . . . . . . . . . . 6
	3.1. Call Forward No Answer . . . . . . . . . . . . . . . . . . 5		3.1. Call Forward No Answer . . . . . . . . . . . . . . . . . . 6
	3.1.1. Approach 1: UA Redirects . . . . . . . . . . . . . . . 6		3.1.1. Approach 1: UA Redirects . . . . . . . . . . . . . . . 7
	3.1.2. Approach II: Proxy Forwards . . . . . . . . . . . . . 7		3.1.2. Approach II: Proxy Forwards . . . . . . . . . . . . . 8
	3.1.3. Approach III: UA Proxies . . . . . . . . . . . . . . . 8		3.1.3. Approach III: UA Proxies . . . . . . . . . . . . . . . 9
	3.1.4. Approach IV: Call Processing Language . . . . . . . . 9		3.1.4. Approach IV: Call Processing Language . . . . . . . . 10
	3.1.5. Failure Cases . . . . . . . . . . . . . . . . . . . . 10		3.1.5. Failure Cases . . . . . . . . . . . . . . . . . . . . 11
	3.1.5.1. No One Implements . . . . . . . . . . . . . . . . 11		3.1.5.1. No One Implements . . . . . . . . . . . . . . . . 12
	3.1.5.2. Both Implement . . . . . . . . . . . . . . . . . . 11		3.1.5.2. Both Implement . . . . . . . . . . . . . . . . . . 12
	3.1.5.3. Missing Half . . . . . . . . . . . . . . . . . . . 11		3.1.5.3. Missing Half . . . . . . . . . . . . . . . . . . . 12
	4. Solution Considerations . . . . . . . . . . . . . . . . . . . 11		4. Solution Considerations . . . . . . . . . . . . . . . . . . . 12
	5. BLISS Solution Framework . . . . . . . . . . . . . . . . . . . 13		5. BLISS Solution Framework . . . . . . . . . . . . . . . . . . . 14
	5.1. Phase I - Identify a Feature Group . . . . . . . . . . . . 13		5.1. Phase I - Identify a Feature Group . . . . . . . . . . . . 14
	5.2. Phase II - Gather Data . . . . . . . . . . . . . . . . . . 15		5.2. Phase II - Gather Data . . . . . . . . . . . . . . . . . . 16
	5.3. BLISS Phase III - Problem Definition . . . . . . . . . . . 15		5.3. BLISS Phase III - Problem Definition . . . . . . . . . . . 16
	5.4. BLISS Phase 4 - Minimum Interop Definition . . . . . . . . 16		5.4. BLISS Phase 4 - Minimum Interop Definition . . . . . . . . 17
	6. Structure of the BLISS Final Deliverable . . . . . . . . . . . 17		6. Structure of the BLISS Final Deliverable . . . . . . . . . . . 18
	7. Security Considerations . . . . . . . . . . . . . . . . . . . 18		7. Security Considerations . . . . . . . . . . . . . . . . . . . 19
	8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 18		8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 19
	9. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 18		9. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 19
	10. Informative References . . . . . . . . . . . . . . . . . . . . 18		10. Informative References . . . . . . . . . . . . . . . . . . . . 19
	Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 19		Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 20
	Intellectual Property and Copyright Statements . . . . . . . . . . 20
	1. Introduction		1. Introduction
	The Session Initiation Protocol (SIP) [RFC3261] has been designed as		The Session Initiation Protocol (SIP) [RFC3261] has been designed as
	a general purpose protocol for establishing and managing multimedia		a general purpose protocol for establishing and managing multimedia
	sessions. In this role, it provides many core functions and		sessions. In this role, it provides many core functions and
	extensions to support "session management features". In this		extensions to support "session management features". In this
	context, session management features (or just features in this		context, session management features (or just features in this
	specification) are operations, typically invoked by the user, that		specification) are operations, typically invoked by the user, that
	provide some form value-added functionality within the context of a		provide some form value-added functionality within the context of a
	skipping to change at page 20, line 4		skipping to change at line 829
	Author's Address		Author's Address
	Jonathan Rosenberg		Jonathan Rosenberg
	Cisco		Cisco
	Iselin, NJ		Iselin, NJ
	US		US
	Email: jdrosen@cisco.com		Email: jdrosen@cisco.com
	URI: http://www.jdrosen.net		URI: http://www.jdrosen.net
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