P-Access-Network-Info ABNF Update
draft-holmberg-dispatch-pani-abnf-03

Abstract

This document updates RFC 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.

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Table of Contents

• 1. Introduction
• 2. Update to RFC 7315
• 3. Security Considerations
• 4. IANA Considerations
• 5. Acknowledgments
• 6. Change Log
• 7. Normative References
• Author's Address

1. 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 updates section 5.4 of [RFC7315], by modifying the extension-access-info part of the P-Access-Network-Info header field ABNF.

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 seen to cause backward compatibility concerns.

2. Update to RFC 7315

This section updates the ABNF defined in section 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-param

				

3. 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.

4. IANA Considerations

This document makes no requests from IANA.

5. Acknowledgments

TBD

6. Change Log

[RFC EDITOR NOTE: Please remove this section when publishing]

Changes from draft-holmberg-dispatch-pani-abnf-02

• Changes based on AD review by Ben Campbell.
• - 'Conventions' section removed, as the draft does not contain any RFC 2119 keywords.
• - Reference to RFC 2119 removed.
• 'operator-specific-GI' and 'utran-sai-3gpp' values added to list of 'access-info' values.
• 24.229 reference version updated.

Changes from draft-holmberg-dispatch-pani-abnf-01

• - Editorial fixes based on comments from Jean Mahoney.
• - Reference to 3GPP 24.229 added.

Changes from draft-holmberg-dispatch-pani-abnf-00

• - Category changed to 'Informational'.

7. Normative References

Author's Address