System is responding 401 unauthorized
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401 unauthorized response from the system is correct.
After that next REGISTER request should follow from the device which tries to register with credentials.
In pcap it looks like this: WWW-Authenticate: Digest algorithm=MD5, realm="asterisk", nonce="0e234d3c"
More details here.
If pcap looks like this:
That means the device is failing with proper registration.
One of the reasons could be that 401 response does not reach the device. Capture pcap on the device side to check this. Fix in the firewall if this is the case.