On 09/19/2011 01:11 PM, Bruce Ferrell wrote:
On 09/19/2011 09:33 AM, Alex Balashov wrote:
Every request needs a From tag.
Uh... OK. Isn't this a From tag:
From: <sip:p...@xx.xx.xx.xx>
Line three of what I send?
No, that's a From URI.
A From tag is a header parameter that is appended to the URI,
delimited by a semicolon:
From: <sip:p...@xx.xx.xx.xx>;tag=abc123xyz
Although, RFC 3261 Section 12.1.1 ("UAS behavior") does seem to
contradict me:
A UAS MUST be prepared to receive a request without a tag in
the From field, in which case the tag is considered to have
a value of null.
However, it goes on to say:
This is to maintain backwards compatibility with RFC 2543,
which did not mandate From tags.
In other words, a non-backward-compatible 3261 implementation will
always generate From tags for all requests.
--
Alex Balashov - Principal
Evariste Systems LLC
260 Peachtree Street NW
Suite 2200
Atlanta, GA 30303
Tel: +1-678-954-0670
Fax: +1-404-961-1892
Web: http://www.evaristesys.com/
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