Multi-line telephony

[Alyw]

I'm currently developing a agent desktop using PSDK 8.5. I've an old version of agent desktop (or softphone) which was intergrated with Genesys ActiveX Desktop Toolkit. There were three line buttons in the old version and I found that the buttons are the components inherited from the ActiveX Desktop Toolkit. So, with the use of pSDK 8.5, how can I configure the line number in my agent desktop? I want to do exactly the same as the old version, which had three line buttons.

[cavagnaro]

Same, you monitor 3 DNs...just that, means 3 instances of Extension object

[Alyw]

So for example, if I make an outbound call using line 2, when I send the RequestMakeCall, is it the way to send the request:
KeyValueCollection lineNum = new KeyValueCollection();
lineNum.Add("ext", "2");
RequestMakeCall reqMakeCall = RequestMakeCall.Create(thisDN, callNum, MakeCallType.Regular, null, null, null, lineNum);