Visual Basic 6 (VB6)

Hi everyone,

I've just started to develope a C# SIP softphone, but I've stuck with the process for a couple of days. The ringing itself isn't working.
I plan to use this program (http://www.voip-sip-sdk.com/p_190-how-to-ring-a-c-sip-softphone-using-the-sip-stack-without-using-an-ip-pbx-voip.html), but I'm not sure yet.
Maybe some of you have already tried it, and can share their experiences with me.
I would be very grateful for your help and advice!

Best regards,

Keith