RFC Errata


Errata Search

 
Source of RFC  
Summary Table Full Records

Found 1 record.

Status: Reported (1)

RFC 7913, "P-Access-Network-Info ABNF Update", June 2016

Source of RFC: IETF - NON WORKING GROUP

Errata ID: 6678
Status: Reported
Type: Technical
Publication Format(s) : TEXT

Reported By: Dinoop Paloli
Date Reported: 2021-09-06

Throughout the document, when it says:

NA

It should say:

NA

Notes:

As per the Introduction section,

"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. "

This is not true and there is backward compatibility issue due to change in ABNF form of extension-access-info from gen-value to generic-param

For eg:

As per the old RFC the following header was valid,
P-Access-Network-Info: 3GPP-UTRAN-TDD; utran-cell-id-3gpp=23456789ABCDE; "a=c";

See the parameter "a=c" which was allowed as part of "gen-value = token / host / quoted-string"

But generic-param has to be in the form
generic-param = token [ EQUAL gen-value ]

due to this a simple quoted string become invalid.

This causes backward compatibility of new SIP stacks and old networks.

Report New Errata