Goals for Internet Messaging to Support Diverse Service Environments
RFC 4416
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RFC - Informational
(February 2006; No errata)
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2015-10-14
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IETF
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RFC 4416 (Informational)
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Ted Hardie
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Network Working Group J. Wong, Ed.
Request for Comments: 4416 Nortel Networks
Category: Informational February 2006
Goals for Internet Email to Support Diverse Service Environments
Status of This Memo
This memo provides information for the Internet community. It does
not specify an Internet standard of any kind. Distribution of this
memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2006).
Abstract
This document is a history capturing the background, motivation and
thinking during the LEMONADE definition and design process.
The LEMONADE Working Group -- Internet email to support diverse
service environments -- is chartered to provide enhancements to
Internet mail to facilitate its use by more diverse clients. In
particular, by clients on hosts not only operating in environments
with high latency/bandwidth-limited unreliable links but also
constrained to limited resources. The enhanced mail must be
backwards compatible with existing Internet mail.
The primary motivation for this effort is -- by making Internet mail
protocols richer and more adaptable to varied media and environments
-- to allow mobile handheld devices tetherless access to Internet
mail using only IETF mail protocols.
The requirements for these devices drive a discussion of the possible
protocol enhancements needed to support multimedia messaging on
limited-capability hosts in diverse service environments. A list of
general principles to guide the design of the enhanced messaging
protocols is documented. Finally, additional issues of providing
seamless service between enhanced Internet mail and the existing
separate mobile messaging infrastructure are briefly listed.
Wong Informational [Page 1]
RFC 4416 LEMONADE Goals February 2006
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4
2. Conventions Used in This Document . . . . . . . . . . . . . . 6
3. Messaging Terminology and Simple Model (Client-to-Server
Aspect Only) . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1. Messaging Transaction Models . . . . . . . . . . . . . . . 6
3.2. Mobile Messaging Transactions . . . . . . . . . . . . . . 7
3.2.1. Submission . . . . . . . . . . . . . . . . . . . . . . 7
3.2.2. Notification . . . . . . . . . . . . . . . . . . . . . 7
3.2.3. Retrieval . . . . . . . . . . . . . . . . . . . . . . 8
4. Profiles . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.1. Existing Profiles . . . . . . . . . . . . . . . . . . . . 8
4.1.1. Voice Messaging (VPIMv2) . . . . . . . . . . . . . . . 8
4.1.2. iFax . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1.3. Internet Voice Mail (IVM) . . . . . . . . . . . . . . 9
4.2. Putative Client Profiles . . . . . . . . . . . . . . . . . 9
4.2.1. TUI . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2.2. Multi-Modal Clients . . . . . . . . . . . . . . . . . 11
4.2.3. WUI . . . . . . . . . . . . . . . . . . . . . . . . . 11
5. General Principles . . . . . . . . . . . . . . . . . . . . . . 13
5.1. Protocol Conservation . . . . . . . . . . . . . . . . . . 13
5.1.1. Reuse Existing Protocols . . . . . . . . . . . . . . . 13
5.1.2. Maintain Existing Protocol Integrity . . . . . . . . . 13
5.2. Sensible Reception/Sending Context . . . . . . . . . . . . 13
5.2.1. Reception Context . . . . . . . . . . . . . . . . . . 13
5.2.2. Sending Context . . . . . . . . . . . . . . . . . . . 13
5.3. Internet Infrastructure Preservation . . . . . . . . . . . 14
5.4. Voice Requirements (Near Real-Time Delivery) . . . . . . . 14
5.5. Fax Requirements (Guaranteed Delivery) . . . . . . . . . . 14
5.6. Video Requirements (Scalable Message Size) . . . . . . . . 14
6. Issues and Requirements: TUI Subset of WUI . . . . . . . . . . 14
6.1. Requirements on the Message Retrieval Protocol . . . . . . 14
6.1.1. Performance Issues . . . . . . . . . . . . . . . . . . 15
6.1.2. Functional Issues . . . . . . . . . . . . . . . . . . 16
6.2. Requirements on the Message Submission Protocol . . . . . 18
6.2.1. Forward without Download Support . . . . . . . . . . . 18
6.2.2. Quota by Context Enforcement . . . . . . . . . . . . . 19
6.2.3. Future Delivery Support with Cancel . . . . . . . . . 19
6.2.4. Support for Committed Message Delivery . . . . . . . . 20
6.3. Requirements on Message Notification . . . . . . . . . . . 20
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