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Internet Engineering Task Force (IETF)                       C. HolmbergRequest for Comments: 7913                                      EricssonUpdates:7315                                                  June 2016Category: InformationalISSN: 2070-1721P-Access-Network-Info ABNF UpdateAbstract   This document updatesRFC 7315, by modifying the extension-access-   info part of the P-Access-Network-Info header field Augmented Backus-   Naur Form (ABNF), and by adding the following 'access-info' header   field parameter values to the list of 'access-info' header field   parameter values in the ABNF: 'operator-specific-GI' and   'utran-sai-3gpp'.  The values are defined in the ABNF but are not   included in the list.Status of This Memo   This document is not an Internet Standards Track specification; it is   published for informational purposes.   This document is a product of the Internet Engineering Task Force   (IETF).  It represents the consensus of the IETF community.  It has   received public review and has been approved for publication by the   Internet Engineering Steering Group (IESG).  Not all documents   approved by the IESG are a candidate for any level of Internet   Standard; seeSection 2 of RFC 7841.   Information about the current status of this document, any errata,   and how to provide feedback on it may be obtained athttp://www.rfc-editor.org/info/rfc7913.Holmberg                      Informational                     [Page 1]

RFC 7913                        PANI ABNF                      June 2016Copyright Notice   Copyright (c) 2016 IETF Trust and the persons identified as the   document authors.  All rights reserved.   This document is subject toBCP 78 and the IETF Trust's Legal   Provisions Relating to IETF Documents   (http://trustee.ietf.org/license-info) in effect on the date of   publication of this document.  Please review these documents   carefully, as they describe your rights and restrictions with respect   to this document.  Code Components extracted from this document must   include Simplified BSD License text as described in Section 4.e of   the Trust Legal Provisions and are provided without warranty as   described in the Simplified BSD License.Table of Contents1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .22.  Update toRFC 7315  . . . . . . . . . . . . . . . . . . . . .33.  Security Considerations . . . . . . . . . . . . . . . . . . .34.  Normative References  . . . . . . . . . . . . . . . . . . . .4   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .4   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .41.  Introduction   [RFC7315] defines the Session Initiation Protocol (SIP) [RFC3261]   P-Access-Network-Info header field.   The header field syntax contains an 'access-info' header field   parameter, with a set of pre-defined values.  Most pre-defined values   follow the 'generic-param' rule [RFC3261].  However, currently the   Augmented Backus-Naur Form (ABNF) [RFC5234] in [RFC7315] requires new   values to follow the 'gen-value' rule [RFC3261], which is more   restrictive than 'generic-param'.  There is no justification for the   restriction, and new values have already been defined following the   'generic-param' rule.   The ABNF also defines the following 'access-info' header field   parameter values: 'operator-specific-GI' and 'utran-sai-3gpp'.   However, the values are not included in the list of 'access-info'   values.   This document updatesSection 5.4 of [RFC7315], by modifying the   extension-access-info part of the P-Access-Network-Info header field   ABNF.Holmberg                      Informational                     [Page 2]

RFC 7913                        PANI ABNF                      June 2016   As the P-Access-Network-Info header field is mainly used in networks   defined by the 3rd-Generation Partnership Project (3GPP), where new   values following the 'generic-param' rule have been defined   [TS.3GPP.24.229], the update is not considered to cause issues with   backward compatibility.2.  Update toRFC 7315   This section updates the ABNF defined inSection 5.4 of RFC 7315, as   described below:  Old syntax:      access-info            = cgi-3gpp / utran-cell-id-3gpp /                               dsl-location / i-wlan-node-id /                               ci-3gpp2 / eth-location /                               ci-3gpp2-femto / fiber-location /                               np / gstn-location /local-time-zone /                               dvb-rcs2-node-id / extension-access-info      np                     = "network-provided"      extension-access-info  = gen-value  New syntax:      access-info            = cgi-3gpp / utran-cell-id-3gpp /                               dsl-location / i-wlan-node-id /                               ci-3gpp2 / eth-location /                               ci-3gpp2-femto / fiber-location /                               np / gstn-location /local-time-zone /                               dvb-rcs2-node-id / operator-specific-GI /                               utran-sai-3gpp / extension-access-info      np                     = "network-provided"      extension-access-info  = generic-param3.  Security Considerations   The security considerations for the P-Access-Network-Info header   field are defined in [RFC7315].  The ABNF update defined in this   document does not impact the security considerations.Holmberg                      Informational                     [Page 3]

RFC 7913                        PANI ABNF                      June 20164.  Normative References   [RFC3261]  Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston,              A., Peterson, J., Sparks, R., Handley, M., and E.              Schooler, "SIP: Session Initiation Protocol",RFC 3261,              DOI 10.17487/RFC3261, June 2002,              <http://www.rfc-editor.org/info/rfc3261>.   [RFC5234]  Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax              Specifications: ABNF", STD 68,RFC 5234,              DOI 10.17487/RFC5234, January 2008,              <http://www.rfc-editor.org/info/rfc5234>.   [RFC7315]  Jesske, R., Drage, K., and C. Holmberg, "Private Header              (P-Header) Extensions to the Session Initiation Protocol              (SIP) for the 3GPP",RFC 7315, DOI 10.17487/RFC7315, July              2014, <http://www.rfc-editor.org/info/rfc7315>.   [TS.3GPP.24.229]              3GPP, "IP multimedia call control protocol based on              Session Initiation Protocol (SIP) and Session Description              Protocol (SDP); Stage 3", 3GPP TS 24.229 13.5.1, March              2016, <http://www.3gpp.org/ftp/Specs/html-info/24229.htm>.Acknowledgments   Thanks to Ben Campbell, Cullen Jennings, Gonzalo Salgueiro, Jean   Mahoney, Menachem Dodge, Olafur Gudmundsson, Paul Kyzivat, and the   3GPP community for providing guidance, input, and comments on the   document.Author's Address   Christer Holmberg   Ericsson   Hirsalantie 11   Jorvas  02420   Finland   Email: christer.holmberg@ericsson.comHolmberg                      Informational                     [Page 4]