Interworking between the Session Initiation Protocol (SIP) and the Extensible Messaging and Presence Protocol (XMPP): Instant Messaging

Interworking between the Session Initiation Protocol (SIP) and the Extensible Messaging and Presence Protocol (XMPP): One-to-One Text Chat Sessions

“…The XMPP "informal session" approach maps very well into a SIP MESSAGE request, as described in [RFC7572]. However, the XMPP informal session approach can also be mapped to MSRP if the XMPP-to-SIP gateway maintains additional state.…”

“…The mapping of XMPP syntax to SIP syntax MUST be as specified in [RFC7572]. Upon receiving such a message stanza, the XMPP server needs to determine the identity of the domainpart in the 'to' address, which it does by following the procedures explained in Section 5 of [RFC7247].…”

“…o For instant messaging protocols in general, see [RFC2779] o For MSRP chat, see [RFC4975]; for when SIP is used to negotiate MSRP sessions, see [RFC3261] o For XMPP-based instant messaging, see [RFC6121] and also [RFC6120] o For SIP-XMPP interworking in general, see [RFC7247] o For end-to-end encryption of instant messages, see [RFC7572] …”

“…This document specifies mappings for one-to-one text chat sessions (sometimes called "session-mode" messaging); in particular, this document specifies mappings between XMPP messages of type "chat" and the Message Session Relay Protocol (MSRP) [RFC4975], which is commonly used in SIP-based systems for chat functionality (although note that MSRP is not conjoined to SIP, and can be used by non-SIP technologies). Mappings for single instant messages and groupchat are provided in [RFC7572] and [GROUPCHAT].…”

Interworking between the Session Initiation Protocol (SIP) and the Extensible Messaging and Presence Protocol (XMPP): Groupchat

“…As mentioned in [RFC7572], there are several possible methods for end-to-end encryption of one-to-one instant messages. Unfortunately, because there is no widely deployed method for end-to-end encryption of multi-party instant messages, this document cannot provide a recommendation in this regard.…”