Hello Mosbah,

> we try to register on IMS using SIPp but this error appear in the SIPp
> terminal, if any one know what we should do to overcome this error ...

When you look at the messages received from OpenIMSCore you will see that
instead of receiving "200 OK" on the 2nd REGISTER request again a "401
Unauthorized - Challenging the UE" is received. The SIPp scenario is not
prepared for this. Therefore the problem is on the registration procedure to
OpenIMSCore and it is not a SIPp problem.

Next question is: Why does OpenIMSCore not accept the 2nd REGISTER?
The problem is the authentication mechanism applied by S-CSCF. There are
some authentication mechanisms supported by OpenIMSCore (see the
authentication data provisioned in HSS at the Private User Identity). And
there are also default algorithm values to be provisioned at the S-CSCF (see
scscf.cfg).

SIPp supports two authentication algorithm: Digest/MD5 ("algorithm="MD5"")
and Digest/AKA ("algorithm="AKAv1-MD5"", as specified by 3GPP for IMS).

I suggest that you set the registration_default_algorithm in scscf.cfg to
"HSS-Selected" and than you can select the authentication algorithm to be
applied via provisioning in HSS. You than can select one of the two
supported algorithms and the registration probably will be accepted.

regards
Franz


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