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AsterNET
AsterNET is an open source .NET framework for Asterisk AMI and FastAGI. AsterNET allows you to talk to Asterisk AMI from any .NET application and create FastAGI applications in any .NET language.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
- Javascript (I saw sip.js and also open-voip-alliance/WebphoneLib)
Asterisk has it's AGI and AMI protocols for control. I've used this in the past with Adhearsion for a few basic tasks. There is a C# AGI library, AsterNET, which might be of interest: https://github.com/AsterNET/AsterNET