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
Invite to session
Cancel session
End session
Send message
Send info
Update session
Subscribe
Refresh subscription
Notify
Presence
Instant Messaging
Logging

Supported .NET Versions / Platforms
.NET Framework 2.0+
.NET Standard 2.0+
.NET Core 2.0+
Mono 2.8+
Xamarin
Microsoft Azure, Amazon AWS and other cloud platforms



Only for V.I.P