如何使用 C# 构建软电话（使用 SIP 协议）
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How to build a softphone (using SIP protocol) using C#
提问by Srikanth V M
I have this challenge to build an sip softphone using c# or .net technologies.
我面临着使用 c# 或 .net 技术构建 sip 软电话的挑战。
Please guide me the technology, requirements and specifications that is needed to build such.
请指导我构建此类所需的技术、要求和规范。
Possible requirements:
可能的要求：
Supported codecs:
支持的编解码器：
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
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
语音：
实时质量监控 (MOS) 3 条独立电话线
自动应答/请勿打扰呼叫
转移全双工
录音压缩音频数据。与 symbian s60 完全兼容的 PC2Phone 和 Mobile2Phone（iPhone、诺基亚 N95）应用程序的 SIP 兼容软电话/拨号器，应提供完整的源代码。
兼容 Windows 2000/XP/2003/Vista/Mac
NAT/防火墙穿越功能
适用于任何第 3 方 SIP 服务器
支持SIP出站代理
显示来电者帐户余额
显示通话信用时间
自动回声消除
自动抖动缓冲调整
最后号码重拨
最后拨打的 10 个号码的历史记录
快速拨号用户列表
为客户快速开通，只需要用户名和密码
回答by abhilash
回答by yogman
Microsoft Real-Time Communications: Protocols and Technologies http://technet.microsoft.com/en-us/library/bb457036.aspx
Microsoft 实时通信：协议和技术 http://technet.microsoft.com/en-us/library/bb457036.aspx
回答by jnielsen
Konnetic provide fully managed SIP components for .NET development.
Konnetic 为 .NET 开发提供完全托管的 SIP 组件。
Their SIP .NETSDK is available here and is probably the most comprehensive. They also provide an MSRP library.
他们的SIP .NETSDK 可在此处获得，并且可能是最全面的。他们还提供了一个 MSRP 库。
Otherwise, Microsoft's Lync server comes with a very good managed SIP library, available here: www.microsoft.com/en-us/lync/default.aspx
否则，Microsoft 的 Lync 服务器带有一个非常好的托管 SIP 库，可在此处获得：www.microsoft.com/en-us/lync/default.aspx
回答by jwri
http://www.konnetic.comis 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.
http://www.konnetic.com是一个相对较新的补充。全面管理。使用 SIP 和 SDP 所需的一切。他们没有像许多其他人一样在标准中摘取低垂的果实。Microsoft Lync 服务器同样出色但与 Microsoft 紧密相关。
