bug in draft-ietf-sip-gruu-15 grammar

Hi,

draft-ietf-sip-gruu-15 contains (amongst others) these ABNF rules:

| contact-params  =/ temp-gruu / pub-gruu
| temp-gruu       =  "temp-gruu" EQUAL LDQUOT *(qdtext / quoted-pair )
|                    RDQUOT
| pub-gruu        =  "pub-gruu" EQUAL LDQUOT *(qdtext / quoted-pair )
|                    RDQUOT

which, when adding them to the grammar from RFC 3261, would produce
from <Contact> a language that's a superset of the language that would
be produced by <Contact> from RFC 3261-only.

In particular, the language produced by <foo> is a subset of the
"GRUU extended" language, but not of the RFC 3261-only one:

| foo = "m: <sip:[email protected]>;temp-gruu=" DQUOTE "x" DQUOTE SP CRLF

To put it in more practical terms: the <RDQUOT> in both <temp-gruu> and
<pub-gruu> allow for trailing <LWS>, which <contact-extension> does
not, so an implementation conforming to draft-ietf-sip-gruu-15 could
produce a Contact header that potentially could not be parsable
(except as an <extension-header>) by an implementation conforming
to RFC 3261.

Thus, I would suggest to replace the rules quoted above by:

| contact-params  =/ temp-gruu / pub-gruu
| temp-gruu       =  "temp-gruu" EQUAL LDQUOT *(qdtext / quoted-pair )
|                    DQUOTE
| pub-gruu        =  "pub-gruu" EQUAL LDQUOT *(qdtext / quoted-pair )
|                    DQUOTE

This produces the same language, maybe it's a better replacement:

| contact-params  =/ temp-gruu / pub-gruu
| temp-gruu       =  "temp-gruu" EQUAL quoted-string
| pub-gruu        =  "pub-gruu" EQUAL quoted-string

Florian
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