#We use TraySoft AddTAPI.NET component on all our products with TAPI intigration
https://www.traysoft.com/add-tapi-telephony-library

Currently c-entron.NET, c-entron Outlook Addin and ServiceBoard have TAPI-Modules.

The dlls can be found on our network drives under `P:\Entwicklung C#\Components\AddTapi.NET Professional 18.11.2021`

**OUR Traysoft.AddTAPI.dll has been modified to work with .NET 5/6**

If you update this .dll you need to check if this needs to be modified again. 

##How to update

First you need a decompiled version of TraySoft.AddTapi.dll. The easiest way to do this is to use dotPeek, decompile the dll and then export as csproj.

Then navigate to the following location:
TapiLine.cs  > ProcessIncomingCall

In this method the BeginInvoke call is no longer supported in our new .NET runtimes.
We can simply replace this call with the following code that *should* result in the same behavior.

```
   Task.Factory.StartNew(() =>
   {
       tapiCallHandler.Invoke(call);
   });
```

##How to debug

There are a few ways to debug tapi related things:
 1. a simple TAPI-Test app under `P:\Entwicklung C#\Components\tapi_test_app` which allows a very low level testing.
 2. the product itself of course, there should be vast amounts of logging everywhere (check PhoneManager.cs & TapiPhoneConnectionManager.cs in c-entron.NET)
 3. if your product uses the UI in centron.Controls there's a testtool in Centron.Controls.Preview

If you need very low level logging of the AddTapi.dll itself, you can use VS and check the output tab when debugging as the dll writes its log there.