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.