RFC 3261, "SIP: Session Initiation Protocol", June 2002

Errata ID: 5598
Status: Held for Document Update
Type: Technical
Publication Format(s) : TEXT
Reported By: Roman Shpount
Date Reported: 2019-01-11
Held for Document Update by: Ben Campbell
Date Held: 2019-02-14

Section 25.1 says:

display-name   =  *(token LWS)/ quoted-string

It should say:

display-name   =  token *(LWS token)/ quoted-string

Notes:

There is a contradiction between the ABNF rule and specification.

The name-addr ABNF rule in RFC 3261 specifies:

name-addr = [ display-name ] LAQUOT addr-spec RAQUOT
addr-spec = SIP-URI / SIPS-URI / absoluteURI
display-name = *(token LWS)/ quoted-string

Based on this, LWS is always required between token and the "<" and the following Name-Address value is invalid: foo<sip:foo@bar.com>

At the same time section 20.10 says:

There may or may not be LWS between the display-name and the "<".

This implies that foo<sip:foo@bar.com> should be acceptable.

I propose to change ABNF rule for display-name to allow no LWS between last token and the "<"

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