// Read configuration parameters
var catiServerAddress = ConfigurationManager.AppSettings.Get("CatiServerAddress");
var wsServerAddress = ConfigurationManager.AppSettings.Get("WsServerAddress");
var proxyServerAddress = ConfigurationManager.AppSettings.Get("ProxyServerAddress");
var companyId = int.Parse(ConfigurationManager.AppSettings.Get("CompanyId"));
var user = ConfigurationManager.AppSettings.Get("UserName");
var password = ConfigurationManager.AppSettings.Get("Password");

// Create and configure LogOn service proxy class
var logonClient = new LogOnSoapClient();
logonClient.Endpoint.Address = new EndpointAddress(logonClient.Endpoint.Address.ToString().Replace("localhost", wsServerAddress));

// Log on and generate xConfirmitApiKey
var xConfirmitApiKey = logonClient.LogOnUser(user, password);

// Create RestClient class
var client = new RestClient(catiServerAddress, proxyServerAddress, xConfirmitApiKey, companyId);

// Create service class
ICallHistoryService callHistoryService = new CallHistoryService(client);

// Get all call history data
var data = await callHistoryService.GetAsync("");