Office .NET allows you to easy create, read, modify and parse Word documents, Spreadsheets, Presentations and Open Document Format documents. Office .NET is API for .NET Framework / .NET Core. It is a compilation of Word .NET, Spreadsheet .NET, Presentation .NET and ODF .NET. The Office .NET combines all of these components in the one component.

SIP .NET is Session Initiation Protocol API for .NET Framework / .NET Core. The API is written in 100% managed C# code.

Features
Digest authentication
Supports TCP and UDP protocols
Supports call hold, call waiting, call transfer, call forward, etc.
Support methods: REGISTER, INVITE, OPTIONS, PRACK, ACK, BYE, CANCEL, MESSAGE, SUBSCRIBE, NOTIFY, UPDATE, INFO, REFER, PUBLISH
Create SDP messages
Parse SDP messages
Register
Unregister