这些怎么样...
希望这些有用，如果不是的话，我们深表歉意。
What about these...
Hope these are useful, apologies if they are not.
软件推荐堆栈交换中提出了类似的问题并得到了解答。问题和详细答案涵盖不同的选项和摘要。
原始问题/答案先睹为快：
有希望：
并非如此有希望：
完全不需要：
归功于@BatteryBackupUnit
A similar question was asked and answered in the Software Recommendations Stack Exchange.The Question and the detailed answer covering different options and summary.
A Sneak peek from original question/answer:
Promising:
Not so promising:
Not at all:
Credits to @BatteryBackupUnit
pjsip.net，它是 C pjsip 库。
sipsorcery 完全C# SIP库，就RTP和媒体功能而言不完整。
pjsip.net which is an C# wrapper on the C pjsip library.
sipsorcery fully C# SIP library, incomplete as far as RTP and media functions.
查看 Ozeki VoIP SIP SDK
Take a look at Ozeki VoIP SIP SDK
为了结束这个问题，几年前，我们让 ABTO llc 为我们构建了他们的 SIP 客户端的自定义版本。
这是我们从他们那里购买的托管代码实现。
效果非常好，但该项目后来被取消了。
感谢您提供的所有信息和答案。
To close this off, a few years ago we got ABTO llc to build us a custom version of their SIP client.
It was a managed code implementation that we purchased from them.
It worked very well, but the project was canned later on.
Thanks for all the info and answers.
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这些怎么样...
希望这些有用，如果不是的话，我们深表歉意。
What about these...
Hope these are useful, apologies if they are not.
软件推荐堆栈交换中提出了类似的问题并得到了解答。
问题和详细答案涵盖不同的选项和摘要。
原始问题/答案先睹为快：
有希望：
并非如此有希望：
完全不需要：
归功于@BatteryBackupUnit
A similar question was asked and answered in the Software Recommendations Stack Exchange.
The Question and the detailed answer covering different options and summary.
A Sneak peek from original question/answer:
Promising:
Not so promising:
Not at all:
Credits to @BatteryBackupUnit
pjsip.net，它是 C pjsip 库。
sipsorcery 完全C# SIP库，就RTP和媒体功能而言不完整。
pjsip.net which is an C# wrapper on the C pjsip library.
sipsorcery fully C# SIP library, incomplete as far as RTP and media functions.
查看 Ozeki VoIP SIP SDK
Take a look at Ozeki VoIP SIP SDK
为了结束这个问题，几年前，我们让 ABTO llc 为我们构建了他们的 SIP 客户端的自定义版本。
这是我们从他们那里购买的托管代码实现。
效果非常好，但该项目后来被取消了。
感谢您提供的所有信息和答案。
To close this off, a few years ago we got ABTO llc to build us a custom version of their SIP client.
It was a managed code implementation that we purchased from them.
It worked very well, but the project was canned later on.
Thanks for all the info and answers.