[SR-Users] potential PRACK related topos bug

Juha Heinanen jh at tutpro.com
Tue Apr 20 09:03:14 CEST 2021

Sorry, but it turned out that in calls where B replies first with "183
Session Progress" and which A acknowledges with PRACK request, P1 is not
able to forward the PRACK, but responds with "404 Not found".

I cannot reproduce this in my test environment, because I don't have a
SIP UA that uses Session Progress.  Here is censored debug from
production environment on what happens when P1 receives the PRACK:


-- Juha

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