[Serusers] cisco 7960 authentication failure

hi, I'm trying to use www_authorize/www_challenge (ser 0.8.11/solaris) together with my cisco 7960 (auth backend is mysql and calculate_ha1=1). when I reach www_authorize (with, as I believe, proper authorization) I get the following error message: pre_auth(): Credentials received are not filled properly sent to client: WWW-Authenticate: Digest realm="zettou.net", nonce="3f5e52fd5db948e3b493525f89fe24bfd0f86d9e", qop="auth" sent from client: Authorization: Digest username="jakob(a)schlyter.net".net", realm="zettou.net",uri="sip:schlyter.net", response="8503ab9b93e73ef0033d0e265f31dd0f", nonce="3f5e52fd5db948e3b493525f89fe24bfd0f86d9e", cnonce="718436df",qop=auth,nc=00000001,algorithm=md5 what have I done wrong? jakob