[SR-Users] Problems with Mar portion of registration

[mrichardson]

The MAR portion of registration is either not happening or failing
causing scscf to die.   Using Kamailio 4.0 with the ims_auth module.
We're trying to determine what
the REGISTER block should look like and what ims_auth parameters are
necessary for a successful MAR challenge with auth vector delivery.   We
currently only get the UAR by ICSCF then the SAR by SCSCF.

Module parameters:
# -- ims_auth params --
modparam("ims_auth", "name", URI)
modparam("ims_auth", "registration_default_algorithm", REG_AUTH_DEFAULT_ALG)
modparam("ims_auth","ignore_failed_auth",0)
#!ifdef CXDX_FORCED_PEER
modparam("ims_auth", "cxdx_forced_peer", CXDX_FORCED_PEER)
#!endif
modparam("ims_auth", "cxdx_dest_realm", NETWORKNAME)
modparam("ims_auth", "av_request_at_once", 1)
modparam("ims_auth", "registration_qop", "auth")

route[REGISTER] {
          xlog("L_ERR", "Enter register block");
          t_newtran();

          ims_www_authenticate(NETWORKNAME);
         #check to see if user is authenticated - ie sip header has auth
information - (already challenged)
         if ($avp(maa_return_code) == 1) {
                 # user has not been authenticated. Lets send a challenge
via 401 Unauthorized
                 ims_www_challenge("$td");
                 exit;
         } else {
                 # We need to check if this user is registered or not
                 if (!impu_registered("location")) {
                         save("location");
                         if ($avp(saa_return_code) == 1) {
isc_match_filter_reg("0","location");
                                 exit;
                         }
                 } else {
                         save("location");
                         if($avp(saa_return_code) == 1) {
                                isc_match_filter_reg("1","location");
                                exit;
                         }
                 }
         }
}


12(22978) INFO: cdp [receiver.c:910]: peer_connect(): Peer 
hss.ims.somecompany.com:3868 connected
  0(22966) ERROR: <script>: Enter register block 0(22966) INFO: 
ims_registrar_scscf [cxdx_sar.c:79]: created AVP successfully : 
[saa_return_code] - [-2]
  5(22971) INFO: ims_registrar_scscf [cxdx_avp.c:138]: 
cxdx_get_experimental_result_code: Failed finding avp
  5(22971) INFO: ims_registrar_scscf [cxdx_sar.c:79]: created AVP 
successfully : [saa_return_code] - [1]
  5(22971) WARNING: tm [t_lookup.c:1559]: WARNING: script writer didn't 
release transaction