History

Where it all started

Many many years ago, I wrote a an automated dialer program written in VB6 and using a library called VisualVoice. This communicated with Dialogic Analog boards. Typically Dialogic D/41H jct-ls, D/120 jct-ls

Either VisualVoice went out of business or they never created a C# version, I am just not sure. Wanting to move forward, I created the IvrToolkit project. The API is fairly similar to what VisualVoice did in order to keep conversions simple. We were still using analog voice boards from Dialogic.

Eventually the company I worked for wanted to move to SIP so a coworker of mine wrote the first version of the ivrToolkit.Dialogic.Sip in C++. We used that plugin for years. However, that C++ version was very hard to maintain so I converted it to C# which exists today. It was always based on the Dialogic HMP driver. The HMP driver uses a virtual board. I think they did this so that the HMP API was somewhat similar to the analog API that they had. It was either that or it allowed them to charge $$$ for the number of lines. You can only have one outbound call per line.

SipSorcery. Recently, I took a look at Sipsorcery and figured I would give that a try. I am very pleased with what I am seeing so far and if it pans out, I think it will, I will start using it instead of the Dialogic SIP plugin. All I have to do is swap the Dialogic plugin for the SipSorcery plugin and it is done!