#17 Registration procedure failing with 401 Rsp in Loop.

[praveen chebolu]

SIP registration failing during Authorization response calculation.
After 401 response calculation when we send REGISTER method again we are getting 401 response from Server.

How to debug this issue further? How can we configure IMS Server to run only Digest-MD5 algorithem?
When i change Authorization scheme to only Digest-MD5 algorithm, i am getting 403 forbidden with no matching HSS scheme present. How to change Authorization scheme?