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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

Community
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Srikanth V M
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  • Refer these links for furthur knowledge http://www.codeproject.com/KB/cs/SIP_stack_with_SIP_proxy.aspx http://stackoverflow.com/questions/498056/c-sip-stack-library – Srikanth V M Aug 11 '09 at 09:41
  • Possible duplicate: http://stackoverflow.com/questions/498056/c-sharp-sip-stack-library – Factor Mystic Oct 14 '12 at 03:58

2 Answers2

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Konnetic provide fully managed SIP components for .NET development.

Their SIP .NET SDK is available here and is probably the most comprehensive. They also provide an MSRP library.

Otherwise, Microsoft's Lync server comes with a very good managed SIP library, available here: www.microsoft.com/en-us/lync/default.aspx

jnielsen
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Update: Domain is now for sale, and Konnetic is now a fly-fishing technology.

http://www.konnetic.com is a relatively new addition. Fully managed. Everything you need to work with SIP and SDP. They haven’t picked the low-hanging fruit in the standard like a lot of the others.

Just as good but tied to Microsoft is the Microsoft Lync server.

General Grievance
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jwri
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