VoipSipSdk
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   I am now looking for voip solutions. And found information about Voip sdk. 
 According to their website (http://www.voipsipsdk.com/)
 Voip sdk is based on IETF standards (SIP, STUN, etc.), so it should be compatible with other standard based products such as Asterisk, OpenSER other.
 
 They have all features I need:
 # Dynamically loadable codecs
 # Registrar support
 # Play wav files into conversation
 # Record conversation into file
 # Hold/Retrieve call
 # Forward Call (Blind Call Transfer)
 # Transfer Call (Attended Transfer)
 # Mute Sound
 # VPN support
 # Noise reduction
 # Auto gain
 # Jitter buffer parameters
 # Samples on Delphi, C#, VB, VB.NET, C++ 2005, C++ 6.0, HTML (SIP ActiveX)
 # Windowless samples on C++ and .NET
 # DTMF
 # Adaptive silence detection
 # Adaptive jitter buffer
 # STUN support
 # Comes as ActiveX control
 
 But before I will download the evaluation version I would like to hear other people experience.29 jun 2009, 10:19 John-voip