Ozeki VoIP sdk does not work properly

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C#

WinForms

Hi
I have developed a winform app and used Ozeki.VoIP sdk by reading tutorials, but it does not register sip account to elastix PBX and after a moments it "time out". But I cant register account using free softphones like Expresstalk ....

I saw sip debug messages in server and see there was not request from my win app. I also added this winform app into firewall exceptions.

Would you help me please?

Here is my code:

private static ISoftPhone mySoftphone;   // softphone object
        private static IPhoneLine phoneLine;   // phoneline object

        private static void Main(string[] args)
        {
            //Create a softphone object with RTP port range 5000-10000, and SIP port 5060
            //mySoftphone = SoftPhoneFactory.CreateSoftPhone(5000, 5060);
            mySoftphone = SoftPhoneFactory.CreateSoftPhone(SoftPhoneFactory.GetLocalIP(), 5000, 5700);

            // SIP account registration data, (supplied by your VoIP service provider)
            var registrationRequired = true;
            var userName = "100";
            var displayName = "100";
            var authenticationId = "100";
            var registerPassword = "12345rt";
            var domainHost = "192.168.150.134";
            var domainPort = 5060;

            // Send SIP regitration request
            mySoftphone_Register(mySoftphone, registrationRequired, displayName, userName, authenticationId, registerPassword,
                             domainHost, domainPort);

            // prevents the termination of the application
            while (true) Thread.Sleep(10);
        }


        static void mySoftphone_Register(ISoftPhone softphone, bool registrationRequired, string displayName, string userName,
        string authenticationId, string registerPassword, string domainHost, int domainPort)
        {
            try
            {
                var account = new SIPAccount(registrationRequired, displayName, userName, authenticationId, registerPassword, domainHost, domainPort);
                var natConfiguration = new NatConfiguration("192.168.150.1",true);

                PhoneLineConfiguration plin=new PhoneLineConfiguration(account);
                plin.NatConfig=natConfiguration;

                phoneLine = softphone.CreatePhoneLine(plin);
                phoneLine.RegistrationStateChanged += mySoftphone_PhoneLineStateChanged;
                softphone.RegisterPhoneLine(phoneLine);
            }
            catch (Exception ex)
            {
                Console.WriteLine("Error during SIP registration: " + ex.ToString());
            }
        }

        static void mySoftphone_PhoneLineStateChanged(object sender, RegistrationStateChangedArgs e)
        {
            if (e.State == RegState.NotRegistered || e.State == RegState.Error)
                Console.WriteLine("Registration failed!");

            if (e.State == RegState.RegistrationSucceeded)
                Console.WriteLine("Registration succeeded - Online!");
        }