使用固定电话的资源？
我几乎没有涉及将计算机或arduino插入我的固定电话（或之前）的项目想法。例如，我想抓取有人打电话时发送的来电显示，在网络或地址簿中进行查找，并在 LED 屏幕上显示相关的姓名。
问题是我找不到用于传输此呼叫者 ID 等协议的任何资源。我可能滥用了我的谷歌技能，所以有人可以给我一些指示吗？
我对围绕固定电话发展的所有协议特别感兴趣（来电显示转发/阻止、发送短信、开始/结束通话等）。据我了解，虽然长距离部分（从中心到中心）是数字，但到达客户端电话的信号仍然是模拟的。是真的吗？
I have few projects ideas that involve plugging a computer or an arduino to my landline phone (or just before it). For example, I would like to grab the caller ID sent when someone calls, do a lookup on the web or in an address book, and display the associated name on a LED screen.
The problem is that I can't find any resources on the protocols used for transmitting this caller ID, etc. I may have misused my google skills, so could anyone give me some pointers ?
I am particularly interested in all the protocols evolving around landline phones (caller ID forwarding/blocking, sending SMS, starting/ending a call, etc.). It is my understanding that while the long distance part (from central to central) is numeric, the signal reaching the phone on the customer side is still analogic. Is it true ?
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大多数公共电话网络 (PSTN) 都有一个数字核心（交换机到交换机）和一个模拟边缘（从边缘交换机到家里的电话）。
商业和大型园区（酒店、医院、学院 - 单个或位置较近的站点上的任何大型组织）通常会有本地电话系统和交换机 (PABX)，它将以数字方式与边缘交换机进行通话，并且越来越多地可能以数字方式进行通话也到桌面电话。
实际上，有许多不同的标准用于通过模拟电路将 CLI 发送到您的家庭电话，具体取决于您所在的位置以及您的运营商是谁 - 请参阅以下链接作为一个很好的起点，尽管它是旧的并且链接看起来损坏）：
http://www.ainslie.org.uk/callerid/ cli_faq.htm#Q_6
这个也可能有用：
http://www.tech-faq.com/fsk.html
The majority of public telephone networks (PSTNs) have a digital core (switch to switch) and an analogue edge (from the edge switch to your phone at home).
Business and large campuses (Hotels, Hospitals, Colleges - any large organization on a single or closely located sites) often will have a local phone system and switch (PABX) which will speak digitally to the edge exchange and which, increasingly, may speak digitally to the desk phones also.
There are actually a number of different standards in use for sending the CLI over the analogue circuit to your home phone depending on where you are and who your operator is - see the following link as a good starting point, although it is old and the links appear broken):
http://www.ainslie.org.uk/callerid/cli_faq.htm#Q_6
This one may also be useful:
http://www.tech-faq.com/fsk.html