On 10/4/17 4:20 PM, Andrew Pogrebennyk wrote:
Hi,
I understand that there is no normative document for a B2BUA but in
general as common sense dictates should the B2BUAs that generate
multiple outgoing requests on their UAC side for a single incoming
request due to parallel forking create unique From-tags or reuse the
same From tag in every request (INVITE)? I have concerns over a SBC
vendor that requires same From tag (else some overload prevention kicks
in) because it looks like re-using From-tag (but having different Via
branches of course) might trigger a loop detected response with some
endpoints as per https://tools.ietf.org/html/rfc3261#section-8.2.2.2
What is the best practice here?
ISTM that if the B2BUA is intending to act mostly like a forking proxy,
then it would make the most sense for it to generate a single new
from-tag for itself corresponding 1:1 with the incoming from-tag on its
UAS side and then use that for all outgoing forks. But that is
technically a violation of UAC behavior, so I can see why some
implementations might not do this.
Thanks,
Paul
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