TwilioNewRelicDemo_UserController.cs

public class UserController : TwilioApiController
{
    public HttpResponseMessage Post(VoiceRequest request, string pin)
    {
        var user = AuthenticationService.GetUser(pin);

        var response = new TwilioResponse();
        response.Say(string.Format("Hello {0}", user.Name));
        response.Pause(2);
        response.Hangup();

        return this.TwiMLResponse(response);
    }
}