metasystema.org
CurrentINFORMATIONALIETF stream

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

In plain English — editorial summary, not part of the RFC

The Third Generation Partnership Project (3GPP) has identified cases where different SIP private header extensions referred to as "P-" header fields, and defined in RFC 7315, need to be included in SIP requests and responses where they were not allowed according to RFC 7315. This document updates RFC 7315, in order to allow inclusion of the affected "P-" header fields in such requests and responses. This document obsoletes RFC 7976. The changes related to RFC 7976 involve the inclusion of the P-Visited-Network-ID header field in SIP responses. This document also makes updates to RFC 7315 in order to fix misalignments that occurred when RFC 3455 was obsoleted by RFC 7315.

Document record

Document ID
RFC9878
Published
November 2025
Authors
C. Holmberg; N. Biondic; G. Salgueiro; R. Jesske
Status
INFORMATIONAL
Stream
IETF
Area
art
Pages
9
Also known as
—
Obsoletes:
RFC 7976
Updates:
RFC 7315

Topics

Related documents

Ranked automatically by shared keywords, IETF area and stream — not by editorial selection.

Also filed under

About this page

The document record above — title, authors, date, status, stream, area, relationships, DOI and errata — is imported verbatim from the public RFC Editor index. The “in plain English” section is editorial: written by The metasystema editorial team, not part of the RFC. Where the two differ, the RFC text governs.

Last checked against the RFC Editor index on . RFCs are never revised after publication; changes are issued as new documents.

Data sources · Editorial policy · Report a correction · What is an RFC?

canonical URL: /rfc/9878-updates-to-private-header-p-header-extension-usage-in-session-initiation-protoco