Hello Henning,
As you pointed out Authenticatio-Info header is prepared, but it
not added while forming  200 OK packet. 
In ims_registrar_scscf module "200 OK"  is formed in reply.c but no where I see
Authentication-info header being added.
Thanks in advance.
regards
Seshu Kumar

On Mon, Oct 15, 2018 at 1:06 AM Henning Westerholt <hw@kamailio.org> wrote:
Am Mittwoch, 10. Oktober 2018, 07:31:36 CEST schrieb Seshu Kumar:
> I have seen logs I didn't find any error per se.
> I am attaching the log file.
> Thank you for answering.

Hello Seshu,

according to the logs the header is at least one time build and added:

5(27138) DEBUG: ims_auth [authorize.c:1663]: add_authinfo_resp_hdr(): authinfo
hdr built: Authentication-Info:
nextnonce="a3dc15ac2c8c9e4a4f9dd25403c891d3",qop=auth,rspauth="7ebe6bfa6b087d23b548143a0c57389a",cnonce="b9d7ed7f",nc=00000001

5(27138) DEBUG: ims_auth [authorize.c:1665]: add_authinfo_resp_hdr(): authinfo
hdr added 5(27138)

Can you observe this header on the network?

Best regards,

Henning


--
Henning Westerholt - https://skalatan.de/blog/
Kamailio security assessment - https://skalatan.de/de/assessment