>>>>> I??aki Baz Castillo <[EMAIL PROTECTED]> wrote:
> Hi, as Bob Penfield pointed in a previous mail, RFC3261 doesn't
> clarify if a 1XX response (that creates an early-dialog) MUST or not
> contain a "Contact" header (that would be need, for example, to send a
> BYE to terminate the early dialog instead of using a CANCEL).
Why do you think so? See table in section 20:
Header field where proxy ACK BYE CAN INV OPT REG
___________________________________________________________
Contact R o - - m o o
Contact 1xx - - - o - -
Contact 2xx - - - m o o
Contact 3xx d - o - o o o
'o' in crossing of "1xx" and "INV" means "optional" and this is explained
in the section:
===
"Optional" means that an element MAY include the header field in a
request or response, and a UA MAY ignore the header field if present
in the request or response (The exception to this rule is the Require
header field discussed in 20.32).
===
For finishing of early dialog, I suppose you should extract contact if it is
sent in response, and avoid to change remote target otherwise.
--
Valentin Nechayev
PortaOne Inc., Software Engineer
mailto:[EMAIL PROTECTED]
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