Changing enable_full_lr parameter from the rr module fixed the issue. Now I'm getting ACK from MS to 200OK.
Thank you

On Wed, 24 Feb 2021 at 15:12, Juha Heinanen <jh@tutpro.com> wrote:

> SIP/2.0 200 OK
> Via: SIP/2.0/TLS 52.114.75.24:5061;branch=z9hG4bK6b5ac083
> Record-Route:
> <sip:fqdn:5067;transport=tls;r2=on;ftag=7a6409ee42ac48a897be110166a2bb0b;lr=on>
> Record-Route: <sip:sip-du-a-eu.pstnhub.microsoft.com:5061;transport=tls;lr>

I have ;r2=on in both R-R headers.  And also you have ;lr=on in one and
;lr in the other.

-- Juha

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