[Serusers] Newbie : SER and sipsak

Hello, I must do a monitoring tool for a SER sip proxy. I have a user and a pass to it. I can make calls with the combination. Tests I-ve ran: rhemaxos root # sipsak -n -s sip:me@myhost:5060 -v SIP/2.0 200 OK Via: SIP/2.0/UDP 127.0.0.1:1675;rport= From: <sip:sipsak@127.0.0.1:1675>;tag=2fbba8ac To: <sip:**************:5060> CSeq: 1 OPTIONS Call-ID: 800827564(a)127.0.0.1 Content-Length: 0 All seem ok but if i run: rhemaxos root # sipsak -I -U -n -s sip:me@myhost:5060 -v -a mypass i get smth like: Call-ID: 2105779733(a)127.0.0.1 WWW-Authenticate: DIGEST realm="whatever.com", nonce="fde24b2e80f3f1c96ec8e962d34627d0", algorithm=MD5, opaque="3251298552" Content-Length: 0 error: couldn't find authentication method Digest in the 402 response above The dumps (i use nast) from Xlite look a lot different. Well, really beats me, i'm new to voip, and i really need help with this one. It does not even try to AUTH me. I know that is my fault, but i need some help with this one. I would not like to read the SIP RFC just to monitor a SIP proxy. I have basic to medium theoretical knowledge of the protocols and no experience in the wild. Thank you in advance Dragos