RFC 5621 · PROPOSED STANDARD · 2009
MON · 27 JUL 2026
Message Body Handling in the Session Initiation Protocol
Overview
RFC 5621, “Message Body Handling in the Session Initiation Protocol”, is a Proposed Standard document published in September 2009 by G. Camarillo. It updates RFC 3204, RFC 3261, RFC 3459. It has since been updated by RFC 8262. The canonical text is published by the RFC Editor.
Abstract
This document specifies how message bodies are handled in SIP. Additionally, this document specifies SIP user agent support for MIME (Multipurpose Internet Mail Extensions) in message bodies. [STANDARDS-TRACK]
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
Read this RFC
The canonical text of RFC 5621 is hosted at rfc-editor.org. Available in TXT,HTML.
Relationships to other RFCs
Other RFCs from 2009
- RFC 5620 RFC Editor Model
- RFC 5622 Profile for Datagram Congestion Control Protocol Congestion ID 4: TCP-Friendly Rate Control for Small Packets
- RFC 5619 Softwire Security Analysis and Requirements
- RFC 5623 Framework for PCE-Based Inter-Layer MPLS and GMPLS Traffic Engineering
- RFC 5618 Mixed Security Mode for the Two-Way Active Measurement Protocol
- RFC 5624 Quality of Service Parameters for Usage with Diameter
- RFC 5617 DomainKeys Identified Mail Author Domain Signing Practices
- RFC 5625 DNS Proxy Implementation Guidelines