Overview

Abstract:  SCOPE .................... .................... .................... 3 2.1 Voice Messaging System Limitations .................... ........3 2.2 Design Goals .................... .................... ..........4 3. PROTOCOL RESTRICTIONS .................... .................... ....5 4. VOICE MESSAGE INTERCHANGE FORMAT .................... .............6 4.1 Message Addressing Formats .................... ................6 4.2 Message Header Fields .................... .................... .9 4.3 Voice Message Content Types .................... ..............15 4.4 Other Message Content Types .................... ..............21 4.5 Forwarded Messages .................... .................... ...23 4.6 Reply Messages .................... .................... .......23 4.7 Notification Messages .................... .................... 24 5. MESSAGE TRANSPORT PROTOCOL .................... ..................24 5.1 ESMTP Commands .................... .................... .......25 5.2 ESMTP Keywords .................... .................... .......27 5.3 ESMTP Parameters - MAIL FROM .................... .............28 5.4 ESMTP Parameters - RCPT TO .................... ...............29 5.5 ESMTP - SMTP Downgrading .................... .................29 6. DIRECTORY ADDRESS RESOLUTION .................... ................30 7. IMAP .................... .................... .................... 30 8. MANAGEMENT PROTOCOLS .................... .................... ....30 8.1 Network Management .................... .................... ...31 9. CONFORMANCE REQUIREMENTS .................... .................... 31 10. SECURITY CONSIDERATIONS .................... .................... 32 10.1 General Directive .................... ..