Hi
This are taken out of bis-08:
"8.1.1.3 From" which is valid for REGISTER says:
"The From field MUST contain a new "tag" parameter, chosen by the
UAC.
See Section 19.3 for details on choosing a tag."
Section "10.2 Constructing the REGISTER Request" says
"From: The value is he same as the To header field unless the
request is a third-party registration."
Note that this sentence means that we "copy" the To header and
the To header does not contains TAG!
Section 10.2 say nothing about tags and the draft
draft-ietf-sip-call-flows-05.txt shows REGISTER request
without any tag in the to and from fields.
Also, I'm testing a SIP phone that includes 2 differents tags
in the "From" and "To" headers?
1 solution:
rfc2543-08 does not mandate tag in The To header. (in request like
register)
rfc2543-08 mandate to copy the to header in the from field for
registration.
(so the to header does not include tag???)
This is not compliant with section 8.1.1.3
2 solution:
rfc2543-08 does not mandate tag in The To header
rfc2543-08 mandate to copy the to header in the from field for
registration.
rfc2543-08 mandate tag in The From header so we add a tag.
In fact, the sentence in section "10.2 Constructing the REGISTER
Request"
saying that the from is a copy of the to is not true any more because
a tag has been added!
3 solution: (choosen by the SIP phone I'm testing.)
The To and From feild contains 2 different tag in the from and to.
Again, From is not a copy of To... and the To contains a tag which
appears to be strange??
4 solution: (I don't think it's valid, but it's better than solution 3
:)
The To and From contains the same tag. From is a copy of the To.
Issue: the To contains a tag which appears to be strange??
What's the solution choosed for rfc2543-08?
I'm sure solution 1 is valid because of rfc2543 backward compatibility.
What about the two other solutions.
Also, should we add a tag in the final response if the To header
does not contains one?
Thanks
Aymeric
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