Cannot make call programatically in WDE

[gaeg0]

Dictionary<string, object> outParameters = new Dictionary<string, object>();
Enterprise.Commons.Collections.KeyValueCollection userData = new Enterprise.Commons.Collections.KeyValueCollection();

outParameters.Add("CommandParameter", _agent.FirstMediaVoice);
outParameters.Add("Destination", outprefix + phoneNumber);
outParameters.Add("MakeCallType", MakeCallType.Regular);
outParameters.Add("UserData", userData);
IChainOfCommand mediaVoiceMakeCall = _commandManager.CreateChainOfCommandByName("MediaVoiceMakeCall");
mediaVoiceMakeCall.Execute(outParameters);


it works.