[SR-Users] Facing issue in Registration of SIP Client

Franz Edler franz.edler at technikum-wien.at
Thu Feb 25 20:38:38 CET 2016

Hi Sainath,

> Created new user with "1003" and given authentication algorithm as
> MD5". Even i tried with authentication algorithm as "SIP Digest" but
> same error as below.
> Configured X-lite softfone and tried to register a user but getting error
> "403 Forbidden - HSS Authentication Scheme Unsupported"

Please look into the tracefile. The Diameter MAR in packet#18 contains 
	AVP: SIP-Authentication-Scheme(608) l=28 f=VM- vnd=TGPP
which leads to " HSS Authentication Scheme Unsupported", because HSS now
expects to challenge with Digest-MD5.

That means that the S-CSCF still uses "AKAv1-MD5" as default authentication
You should change/enable REG_AUTH_DEFAULT_ALG "MD5" in scscf.cfg or - as a
better alternative - use "HSS-Selected".

Then try again.

BR Franz

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