Putting aside the legal issues with the "Do Not Call List", the only way to determine if a phone is valid or not is to listen for a Special Information Tones (SIT) that the carrier puts out when the phone is disabled. To automate this you use something called call progress detection or call progress analysis (CPA). You can do this with some IVR systems and the open standard called Call Control XML (CCXML). Voxeo has an IVR platform that has great CPA and you can try it out for free in their hosted environment. Check out their documentation on outbound calling and it will walk you through using CCXML to make outbound calls and detect the SIT tones. One caveat on SIT tones is that some people put anti-soliciting devices on their phones that basically puts out a SIT tone to fool automated systems.
Here is an article that describes how to use an open source project called VoiceModel to develop a proactive notification system in C# and ASP.NET MVC.
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抛开“谢绝来电名单”的法律问题不谈，确定电话是否有效的唯一方法是收听运营商在电话被禁用时发出的特殊信息音 (SIT)。要自动执行此操作，您可以使用称为呼叫进度检测或呼叫进度分析 (CPA) 的工具。您可以使用某些 IVR 系统和名为呼叫控制 XML (CCXML) 的开放标准来实现此目的。 Voxeo 拥有一个具有出色 CPA 的 IVR 平台，您可以在其托管环境中免费试用。查看他们的关于出站呼叫的文档，它将引导您完成使用 CCXML 进行出站呼叫呼叫并检测 SIT 音。关于 SIT 音调的一个警告是，有些人在手机上安装了反招揽设备，基本上会发出 SIT 音调来欺骗自动化系统。
这里有一篇文章，介绍了如何使用名为 VoiceModel 的开源项目在 C# 和 ASP.NET MVC 中开发主动通知系统。
Putting aside the legal issues with the "Do Not Call List", the only way to determine if a phone is valid or not is to listen for a Special Information Tones (SIT) that the carrier puts out when the phone is disabled. To automate this you use something called call progress detection or call progress analysis (CPA). You can do this with some IVR systems and the open standard called Call Control XML (CCXML). Voxeo has an IVR platform that has great CPA and you can try it out for free in their hosted environment. Check out their documentation on outbound calling and it will walk you through using CCXML to make outbound calls and detect the SIT tones. One caveat on SIT tones is that some people put anti-soliciting devices on their phones that basically puts out a SIT tone to fool automated systems.
Here is an article that describes how to use an open source project called VoiceModel to develop a proactive notification system in C# and ASP.NET MVC.