Hi  401 is normal response for sip auth
It is also normal response for IMS service
Look into sip basic auth mechanism to clarify what is going on here and additionally look into Spec of IMS auth. There should be only auth algo change 
I believe you did not check further request processing.
On Mon, 23 Aug 2021, 18:19 오택경, <ohtk@kaist.ac.kr> wrote:
Hi.

I am implementing the VoLTE setup with the dockerized project (https://github.com/herlesupreeth/docker_open5gs).

I have almost done to run the VoLTE service, but 401 unauthorized error in sip and auth-pending error in fhoss have occured.

How can I fix this problem?

I will share the discussion note in which I tried to solve some problems including the above one.
https://github.com/herlesupreeth/docker_open5gs/issues/55

Very thanks,
Taekkyung Oh.
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