RFC 9878 - Updates to Private Header (P-Header) Extension Usage in Session Initiation Protocol (SIP) Requests and Responses

• Status: Informational
• Published: November 2025
• Stream: IETF
• Category: Informational
• Updates: RFC 7315
• Obsoletes: RFC 7976
• Errata: RFC Editor Errata

Abstract

This document updates RFC 7315 to allow selected SIP P-Header fields in additional SIP requests and responses, and obsoletes RFC 7976.

Contents

• 1. Introduction
• 2. Misalignments and 3GPP Use Cases
• 2.3.2. P-Access-Network-Info
• 2.3.3. P-Charging-Vector
• 3. Updates to RFC 7315
• 4. IANA Considerations
• 5. Security Considerations
• 6. Operational considerations
• 7. Changes since RFC 7976
• 8. References
• Acknowledgments
• Authors' Addresses

Related Resources

• Official Text: RFC 9878
• Official Page: RFC 9878 DataTracker
• Errata: RFC Editor Errata