[Serusers] Ser- asterisk authorization

Hey folks My config is like this UA ------------SER ---------------Asterisk | | | | Mysql registration Now I want the user agent to authenticate itself through asterisk. So when UA passes his credentials to SER. The SER should simply fwd it To the asterisk and asterisk should know that this UA is hanging through SER. I tried few scripts but asterisk sends back 407 Proxy Authentication Required. Can any one help me out and show his config file to me thanks Dipen K Gala Fidelity Investments System Company - Telecom Phone: (617) 563-2729 Email: Dipen.Gala(a)FMR.com