IETF RFC 4356 PDF

This document describes how to exchange messages between Multimedia Messaging Service (MMS) systems (as defined by [3GPP][3GPP2][OMA]) and Internet mail systems (that is, [SMTP] and [Msg-Fmt]). This includes the translation of message formats, message header elements, message delivery reports [DSN-Msg], and message disposition reports [MDN].

The MMS architecture [Stage_2] and specifications [Stage_3] refer to interfaces as reference points named MMx. For example, MM1 is the client-server interface, MM4 is the server-server interface, and MM3 is an interface to "external" or non-MMS systems. The specification in this document can be used for message exchange between any system that uses Internet message formats and protocols and an MMS system; from the perspective of the MMS system, reference point MM3 is used.

This document includes support for voice messages specified by the Voice Profile for Internet Mail [VPIM]. The VPIM specification allows voice messages to be exchanged between voice mail systems using the Internet mail format [Msg-Fmt] and transported via [SMTP]. Thus, the MMS MM3 interface supports the ability to exchange voice messages between an MMS system and a voice mail system. Note that such use is distinct from voice media being part of a user-composed multimedia message.

Note that MM3 can also be used for interworking with "external" (non-MMS) systems other than Internet mail, such as Short Messaging Service (SMS) and access to external mail stores (such as a voice mail system). This specification does not address these other uses or sub-interfaces of MM3; it is only concerned with Internet mail interworking and specifically exchange of messages.

All MM3 Stage 2 [Stage_2] functions are supported except for reply charging and sender address hiding.