rfc9878v3.txt		rfc9878.txt
	Internet Engineering Task Force (IETF) C. Holmberg		Internet Engineering Task Force (IETF) C. Holmberg
	Request for Comments: 9878 N. Biondic		Request for Comments: 9878 Ericsson
	Obsoletes: 7976 Ericsson		Obsoletes: 7976 N. Biondic
	Updates: 7315 G. Salgueiro		Updates: 7315 ETSI
	Category: Informational Cisco Systems, Inc.		Category: Informational G. Salgueiro
	ISSN: 2070-1721 R. Jesske		ISSN: 2070-1721 Cisco Systems, Inc.
			R. Jesske
	Deutsche Telekom		Deutsche Telekom
	October 2025		November 2025
	Updates to Private Header (P-Header) Extension Usage in Session		Updates to Private Header (P-Header) Extension Usage in Session
	Initiation Protocol (SIP) Requests and Responses		Initiation Protocol (SIP) Requests and Responses
	Abstract		Abstract
	The Third Generation Partnership Project (3GPP) has identified cases		The Third Generation Partnership Project (3GPP) has identified cases
	where different SIP private header extensions referred to as "P-"		where different SIP private header extensions referred to as "P-"
	header fields, and defined in RFC 7315, need to be included in SIP		header fields, and defined in RFC 7315, need to be included in SIP
	requests and responses where they were not allowed according to RFC		requests and responses where they were not allowed according to RFC
	skipping to change at line 75 ¶		skipping to change at line 76 ¶
	2.2. Misalignments		2.2. Misalignments
	2.3. 3GPP Use Cases		2.3. 3GPP Use Cases
	2.3.1. General		2.3.1. General
	2.3.2. P-Access-Network-Info		2.3.2. P-Access-Network-Info
	2.3.3. P-Charging-Vector		2.3.3. P-Charging-Vector
	3. Updates to RFC 7315		3. Updates to RFC 7315
	4. IANA Considerations		4. IANA Considerations
	5. Security Considerations		5. Security Considerations
	6. Operational considerations		6. Operational considerations
	7. Changes since RFC 7976		7. Changes since RFC 7976
	8. Acknowledgments		8. References
	9. References		8.1. Normative References
	9.1. Normative References		8.2. Informative References
	9.2. Informative References		Acknowledgments
	Authors' Addresses		Authors' Addresses
	1. Introduction		1. Introduction
	The Third Generation Partnership Project (3GPP) has identified cases		The Third Generation Partnership Project (3GPP) has identified cases
	where different Session Initiation Protocol (SIP) [RFC3261] private		where different Session Initiation Protocol (SIP) [RFC3261] private
	header extensions referred to as "P-" header fields, and defined in		header extensions referred to as "P-" header fields, and defined in
	[RFC7315], need to be included in SIP requests and responses where		[RFC7315], need to be included in SIP requests and responses where
	they were not allowed according to [RFC7315]. This document updates		they were not allowed according to [RFC7315]. This document updates
	[RFC7315], in order to allow inclusion of the affected "P-" header		[RFC7315], in order to allow inclusion of the affected "P-" header
	skipping to change at line 339 ¶		skipping to change at line 340 ¶
	in this document are already defined [TS24.229], the updates are not		in this document are already defined [TS24.229], the updates are not
	seen to cause backward-compatibility concerns.		seen to cause backward-compatibility concerns.
	7. Changes since RFC 7976		7. Changes since RFC 7976
	The changes related to RFC 7976 involve the inclusion of the P-		The changes related to RFC 7976 involve the inclusion of the P-
	Visited-Network-ID header field in SIP responses. Specifically, any		Visited-Network-ID header field in SIP responses. Specifically, any
	SIP response message, with the exception of a 100 (Trying) response,		SIP response message, with the exception of a 100 (Trying) response,
	may include a P-Visited-Network-ID header field.		may include a P-Visited-Network-ID header field.
	8. Acknowledgments		8. References
	The author would like to acknowledge the constructive feedback
	provided by Michael Kreipl, Charles Eckel, and Paul Kyzivat.
	Thanks to Paul Kyzivat, Jean Mahoney, Ben Campbell, and Adam Roach
	for providing comments on an earlier draft version of this document.
	9. References
	9.1. Normative References		8.1. Normative References
	[RFC3261] Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston,		[RFC3261] Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston,
	A., Peterson, J., Sparks, R., Handley, M., and E.		A., Peterson, J., Sparks, R., Handley, M., and E.
	Schooler, "SIP: Session Initiation Protocol", RFC 3261,		Schooler, "SIP: Session Initiation Protocol", RFC 3261,
	DOI 10.17487/RFC3261, June 2002,		DOI 10.17487/RFC3261, June 2002,
	<https://www.rfc-editor.org/info/rfc3261>.		<https://www.rfc-editor.org/info/rfc3261>.
	[RFC7315] Jesske, R., Drage, K., and C. Holmberg, "Private Header		[RFC7315] Jesske, R., Drage, K., and C. Holmberg, "Private Header
	(P-Header) Extensions to the Session Initiation Protocol		(P-Header) Extensions to the Session Initiation Protocol
	(SIP) for the 3GPP", RFC 7315, DOI 10.17487/RFC7315, July		(SIP) for the 3GPP", RFC 7315, DOI 10.17487/RFC7315, July
	skipping to change at line 373 ¶		skipping to change at line 366 ¶
	TS 23.228,		TS 23.228,
	<https://portal.3gpp.org/desktopmodules/Specifications/		<https://portal.3gpp.org/desktopmodules/Specifications/
	SpecificationDetails.aspx?specificationId=821>.		SpecificationDetails.aspx?specificationId=821>.
	[TS24.229] 3GPP, "IP multimedia call control protocol based on		[TS24.229] 3GPP, "IP multimedia call control protocol based on
	Session Initiation Protocol (SIP) and Session Description		Session Initiation Protocol (SIP) and Session Description
	Protocol (SDP); Stage 3", 3GPP TS 24.229,		Protocol (SDP); Stage 3", 3GPP TS 24.229,
	<https://portal.3gpp.org/desktopmodules/Specifications/		<https://portal.3gpp.org/desktopmodules/Specifications/
	SpecificationDetails.aspx?specificationId=1055>.		SpecificationDetails.aspx?specificationId=1055>.
	9.2. Informative References		8.2. Informative References
	[RFC3455] Garcia-Martin, M., Henrikson, E., and D. Mills, "Private		[RFC3455] Garcia-Martin, M., Henrikson, E., and D. Mills, "Private
	Header (P-Header) Extensions to the Session Initiation		Header (P-Header) Extensions to the Session Initiation
	Protocol (SIP) for the 3rd-Generation Partnership Project		Protocol (SIP) for the 3rd-Generation Partnership Project
	(3GPP)", RFC 3455, DOI 10.17487/RFC3455, January 2003,		(3GPP)", RFC 3455, DOI 10.17487/RFC3455, January 2003,
	<https://www.rfc-editor.org/info/rfc3455>.		<https://www.rfc-editor.org/info/rfc3455>.
			Acknowledgments
			The author would like to acknowledge the constructive feedback
			provided by Michael Kreipl, Charles Eckel, and Paul Kyzivat.
			Thanks to Paul Kyzivat, Jean Mahoney, Ben Campbell, and Adam Roach
			for providing comments on an earlier draft version of this document.
	Authors' Addresses		Authors' Addresses
	Christer Holmberg		Christer Holmberg
	Ericsson		Ericsson
	Hirsalantie 11		Hirsalantie 11
	FI-02420 Jorvas		FI-02420 Jorvas
	Finland		Finland
	Email: christer.holmberg@ericsson.com		Email: christer.holmberg@ericsson.com
	Nevenka Biondic		Nevenka Biondic
	Ericsson		ETSI
	Krapinska 45		650 route des Lucioles
	HR-10002 Zagreb		06921 Sophia Antipolis cedex
	Croatia		France
	Email: nevenka.biondic.ext@ericsson.com		Email: Nevenka.Biondic@etsi.org
	Gonzalo Salgueiro		Gonzalo Salgueiro
	Cisco Systems, Inc.		Cisco Systems, Inc.
	7200-12 Kit Creek Road		7200-12 Kit Creek Road
	Research Triangle Park, NC 27709		Research Triangle Park, NC 27709
	United States of America		United States of America
	Email: gsalguei@cisco.com		Email: gsalguei@cisco.com
	Roland Jesske		Roland Jesske
	Deutsche Telekom		Deutsche Telekom
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