here is some info of my environment:
1) OpenSER 1.2 and EyeBeam 1.5
2) run "openserctl tls rootCA", create "cacert.pem" under /etc/openser/tls/rootCA/.
3) run "openserctl tls userCERT", create "user-calist.pem user-cert.pem user-cert_req.pem user-privkey.pem" under /etc/openser/tls/user/.
4) i have set openser.cfg as follow:
    disable_tls = 0
    listen = tls:172.22.14.61:5061
    tls_verify_client = 0
    tls_require_client_certificate = 0
    tls_method = TLSv1
    tls_certificate = /etc/openser/tls/user/user-cert.pem"
    tls_private_key = "/etc/openser/tls/user/user-privkey.pem"
    tls_ca_list = "/etc/openser/tls/user/user-calist.pem"
5) copy "/etc/openser/tls/rootCA/cacert.pem" created at step 2) to EyeBeam clinet machine, which was a Windows XP machine, run "certmrg.msc" there, import this certificate to WindowXP "root certificate store".