public Call HangupCall(string callSid) { Require.Argument("CallSid", callSid); var request = new RestRequest(Method.POST); request.Resource = RequestUri.HangupCallUri; request.AddUrlSegment(RequestUriParams.CallSid, callSid); request.AddParameter("Status", HangupCallStatus.Completed.ToString().ToLower()); return Execute<Call>(request); }