RFC 8591: SIP-Based Messaging with S/MIME

Mobile messaging applications used with the Session Initiation Protocol (SIP) commonly use some combination of the SIP MESSAGE method and the Message Session…

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Outgoing relationships (3 related RFCs)

Updates — RFC 3261: SIP: Session Initiation Protocol
Updates — RFC 3428: Session Initiation Protocol (SIP) Extension for Instant Messaging
Updates — RFC 4975: The Message Session Relay Protocol (MSRP)

Incoming relationships (1 related RFC)

Informatively referenced by — RFC 9475: Messaging Use Cases and Extensions for Secure Telephone Identity Revisited (STIR)