Sergey Sitnikov wrote:
> Hi Doug!
>
> You can't receive response without to tag.
> See p. 15.2(page 78 ) in bis-03.
Actually, you can. A UAC can receive *provisional* responses without a tag
in the To; *final* responses MUST have a tag. Consider a proxy which
sends a "100 Trying" provisional response to the UAC; that responses will
not have a tag in the To.
It gets slightly more complicated when you consider reliable provisional
responses. In those cases, the 18x response will also contain a tag in the
To.
Regards,
- vijay
--
Vijay K. Gurbani vkg@{lucent.com,research.bell-labs.com,acm.org}
Internet Software and eServices Group
Lucent Technologies/Bell Labs Innovations 263 Shuman Blvd., Rm 1A-413
Naperville, Illinois 60566 Voice: +1 630 224 0216 Fax: +1 630 713 0184
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