MUC Extensions

This page gathers the different ways the MUC (XEP-0045) has been extended over the years, in the MUC document itself but not exactly defined or by additional documents. Some of this page may overlap with XEP-Remarks/XEP-0045:_Multi-User_Chat.

Multi-Session Nick

XEP-0045

If allowed by the service, a user can associate more than one full JID with the same occupant JID (e.g., the user juliet@capulet.lit is allowed to log in simultaneously as the nick "JuliC" in the characters@chat.shakespeare.lit chatroom from both juliet@capulet.lit/balcony and juliet@capulet.lit/chamber). Multi-session nicks are not currently defined in this document.

Multi-Session_Nicks

Identification

XEP-0421 Anonymous unique occupant identifiers for MUCs Allows for actions to be associated to a unique identifier when the JID isn't visible.

Moderation

XEP-0425 Message Moderation Allows a moderator to retract messages from other participants.

Invitations

XEP-0249: Direct MUC Invitations Defines a method for inviting a contact to a multi-user chat room directly, instead of sending the invitation through the chat room (mediated invites).

This may be useful if a user blocks messages from unknown JIDs.

Federation / Decentralization

XEP-0281: DMUC1: Distributed Multi-User Chat Defines methods for distributing Multi-User Chat (MUC) rooms across multiple chat services.

XEP-0282: DMUC2: Distributed MUC Multi-User Chats, distributed over several nodes in the XMPP network, using a primary/replica architecture

XEP-0289: Federated MUC for Constrained Environments Provides a protocol for federating MUC rooms together in order to reduce the effects of constrained network (e.g. unreliability, severely limited bandwidth) on the room occupants.

Optimisations

XEP-0410: MUC Self-Ping (Schrödinger's Chat)

Allows clients to check whether they are still joined to a chatroom.

XEP-0436: MUC presence versioning

Reduces the amount of presence trafic

XEP-0437: Room Activity Indicators

Provides a mechanism for activity notifications in MUC

XEP-0463: MUC Affiliations Versioning

Reduces the amount of queries necessary to stay up-to-date with affiliations in a MUC room, while getting rid of races.