[Ekiga-list] help me pls...

[Prakash B]

thanks for guidelines ,so that i installed ekiga, i am now in configuring page of ekiga.
  In 5/10th page i am getting error as
  
   "The Detection of your NAT type finished
   STUN test result: Blocked.
   Ekiga could not detect the type of NAT you are using....
   ...Please make sure you are not running a local fire wall."

this error for whatever be the setting in 4/10th page.
 
help me pls.
  thank for your comments.