OfficeSIP Softphone and Messenger are two enterprise VoIP SIP clients written in C# in .NET Framework. The SIP clients make use of Microsoft UCC API SDK, ensuring the highest quality of audio and video. Compatible with Office Communications Server.
See also open source, cross-platform:
1) simple messenger Brief Msg at http://briefmsg.org
2) MUVConf is a multi-user video conferencing, see demo video http://youtu.be/YrBU-Aqtvrk, download https://code.google.com/p/muvconf/downloads/list
Kill Skype Home gets rid of the Skype Home window that automatically pops up when Skype starts. It also includes features designed to make the Skype experience better for the minimalist at heart.
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The Asterisk .NET library consists of a set of C# classes that allow you to easily build applications that interact with an Asterisk PBX Server (1.0/1.2/1.4 version). Both FastAGI and Manager API supported. .NET/Mono compatible.
Tata messenger is a Java-based instant message sending and receiving tool,most like the microsoft messenger and the Yahoo messenger ,and it will also provides the file transfer ,net meeting(video confrence,video transfer),and file sharing mechanisms
SecureTEL is a peer-to-peer internet phone/chat/file sharing program working over a secure AES-encrypted connection and using a pair of X509 certificates for authentication
SipXTapiDotNet provides an object oriented .Net 2.0 interface to the SipXTapi library that can be found at SipFoundry.org. No more decompiling to IL code to fix Cdecl callbacks -- .Net 2.0 has Cdecl callbacks and more!
Voxampp is an Enterprise IP TriplePlay Application Stack (eIPTAS) a - run-time toolkit - for Internet Entrepreneurs that want to deploy rich IP Carrier Networks. Its goal, to facilitate worldwide Open Access Social Networks using IPTV, VoIP and much more
nSIP is an RFC 3261 compliant implementation of SIP (Session Initiation Protocol) for .NET, written in C#. nSDP is an RFC 4566 compliant SDP parser also in C#, and can be used to make payloads to nSIP messages or to parse any SDP message.
Skype-based wardialer written in C#, can record call results, play a wav file upon the phone being answered. Does full seqential dialing. Saves results to log file.
GibPhone is a highly extensible VoIP/IM client for the .NET framework that uses a powerful plugin engine to allow for UI extensions and any call control stack / media payload / transport protocol combination.
MySXP Client: Is an ActiveX COM Microsoft Windows platform; The objective of this Component is to create a terminal service for a wide open server services as, IM, RPC for client app., RPC, DB terminal, Multiplayer Game client, WebCam, voIP Client.
Cabal is a C++ framework that provides support for high prestation parallel processing network servers and clients. It doesn't provide a protocol, it just gives you the abstraction of data sending/receiving in real time or priority scheduling.