RFC 3801 VPIMv2 June 2004 Table of Contents 1. Introduction...................................................3 1.1. Voice Messaging System Limitations.......................3 1.2. Design Goals.............................................4 1.3. Applicability for VPIM...................................5 2. Requirements Language..........................................5 3. Protocol Restrictions..........................................6 4. Voice Message Interchange Format...............................6 4.1. VPIM Message Addressing Formats..........................7 4.2. Message Header Fields....................................9 4.3. MIME Audio Content Descriptions.........................17 4.4. Voice Message Content Types.............................19 4.5. Other MIME Contents.....................................23 4.6. Delivery Status Notification (DSN)......................25 4.7. Message Disposition Notification (MDN)..................26 4.8. Forwarded Messages......................................26 4.9. Reply Messages..........................................27 5. Message Transport Protocol....................................27 5.1. Base SMTP Protocol......................................28 5.2. SMTP Service Extensions.................................28 5.3. ESMTP - SMTP Downgrading................................30 6. Directory Address Resolution..................................30 7. Management Protocols..........................................30 7.1. Network Management......................................31 8. Conformance Requirements......................................31 9. Security Considerations.......................................32 9.1. General Directive.......................................32 9.2. Threats and Problems....................................32 9.3. Security Techniques.....................................33 10. Normative References..........................................33 11. Acknowledgments...............................................36 12. Appendix A - VPIM Requirements Summary........................37 13. Appendix B - Example Voice Messages...........................43 14. Appendix C - Example Error Voice Processing Error Codes.......49 15. Appendix D - Example Voice Processing Disposition Types.......50 16. Appendix E - IANA Registrations...............................50 16.1. Voice Content-Disposition Parameter Definition.........51 16.2. Multipart/Voice-Message MIME Media Type Definition.....51 17. Appendix F - Change History: RFC 2421 (VPIM V2) To This Doc...53 18. Authors' Addresses............................................54 19. Full Copyright Statement......................................55 Vaudreuil & Parsons Standards Track