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how to build softphone(using SIP protocol) using c#.net

Medium Priority
2,870 Views
Last Modified: 2012-06-27


Hi all! I have this challenge to build an sip softphone using c# or .net technologies.

Please guide me the technology, requirements and specifications that is needed to build such.

Possible requirements:

Supported codecs:
G.722.1, G.723.1, G.726, G.728, G.711, G.729, G.723.1, iLBC,: G.711 (A and m-law),G.729A/B/D/E, AMR, GSM 6.10/EFR, iLBC, Speex

Voice:
      Real time Quality Monitoring (MOS) 3 independent phone lines
      Auto-Answer/Do Not Disturb Call
      Forwarding Full Duplex Audio
      Recording compress the audio data.
   
      Fully SIP compatible softphone/dialer for PC2Phone and Mobile2Phone (iPhone, Nokia N95) application with symbian s60 , full source code should provide.
   
      Compatible with Windows 2000/XP/2003/Vista/Mac
   
      NAT/Firewall traversal feature    

      Works with any 3rd party SIP Server    

      Supports SIP outbound proxy    

      Displays callers account balance  

      Displays call credit time

      Automatic Echo Cancellation

      Automatic jitter buffer adjustment

      Last number Redial

      History of 10 last dialed numbers

      Quick dial user list

      Quick provision for customers, only user name and password required

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