public override bool OpenUrl(UIApplication app, NSUrl url, NSDictionary options) { // Get handle from url var handle = StartCallRequest.CallHandleFromURL(url); // Found? if (handle == null) { // No, report to system Console.WriteLine("Unable to get call handle from URL: {0}", url); return(false); } else { // Yes, start call and inform system CallManager.StartCall(handle); return(true); } }