Hello Guys.
Looks like the default value for sip_warning_noisy_feedback on the cookbooks 4.0.x looks wrong:
It says by default it's enabled, I run couple of test on my kamailio 4.3.4 (x86_64/linux) and I had the header present only when I specifically declared it to 1
Disclaimer: I didn't check the source code yet
Thanks
Alessio