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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
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A SIP softphone is a software program for making telephone calls using SIP-based (Session Initiation Protocol) communications. It allows you to use your computer for calls instead of a physical phone.
A SIP softphone is an application that allows you to place and receive calls on a virtual phone that runs on the open source SIP protocol. A common term for the standard that allows voice chat is VoIP. SIP is a protocol that allows you to share voice, video chat, presence, text messages, documents and more.
Calling Linphone Users from Incredible PBXAssign an Extension Number and Name to the custom extension. Then click on the Advanced tab. In the Dial field, enter the SIP URI for the Linphone user, e.g. SIP/[email protected]. Click Submit and then Reload the Dialplan.
Linphone is an open source SIP phone that makes it possible to communicate freely with people over the internet.
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
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