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Softphone building

Posted By: JSmith     Posted Date: November 18, 2011    Points:5   Category :Others
I am a PhD student and got this task to write an article about softphones. I read the wiki pages and some other websites and got to this


SDK page. It sounds that it covers all the matters about softphones, but I have to be sure, as my professor will know if I didn't find every possibility. Do you think that writing an article about this page will be enough about softphone technologies?

Author: allensmith             
Posted Date: March 08, 2015     Points: 20   

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


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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