SIP registration using Ozeki SDK not working

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ASP.NET

general

C#5.0

when i try to register my sip account that time it gives Time out error
below is code

var account = new SIPAccount(registrationRequired, displayName, userName, authenticationId, registerPassword, domainHost, domainPort);
              Console.WriteLine("\nCreating SIP account {0}", account);

              // With the SIP account and the NAT configuration, we can create a phoneline.
              phoneLine = softphone.CreatePhoneLine(account);
              Console.WriteLine("Phoneline created.");
              // The phoneline has states, we need to handle the event, when it is being changed.
              phoneLine.RegistrationStateChanged += phoneLine_PhoneLineStateChanged;

              // If our phoneline is created, we can register that.
              softphone.RegisterPhoneLine(phoneLine);

and after that I got OUT PUT
________________________________

Phoneline created.
Phone line state changed : RegistrationRequested
Phone line state changed : Error

I provided all my details for crating an account