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



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

srikanth_mattiAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

topdog770Commented:
Hello srikanth:
First off, 50 points for this question, seems out of balance.  You're asking for the world and basically asking for it for free.
 
Here's a couple of promising links:
http://stackoverflow.com/questions/498056/c-sip-stack-library
http://www.codeproject.com/KB/cs/SIP_stack_with_SIP_proxy.aspx
 
Does open source C# SIP exist? According to this posting, the answer is no.
http://bytes.com/groups/net-c/254426-sip-stack-c 
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
C#

From novice to tech pro — start learning today.