Multiple-Recipient MESSAGE Requests in the Session Initiation Protocol (SIP)
This document specifies a mechanism that allows a SIP User Agent Client (UAC) to request a SIP URI-list (Uniform Resource Identifier list) service to send a SIP MESSAGE request to a set of destinations. The client sends a SIP MESSAGE request that includes the payload along with the URI-list to the MESSAGE URI-list service, which sends a similar MESSAGE request to each of the URIs included in the list.