Do you know what a telephone is? It's a device that lets you talk to people who are far away. But did you know that phones can also talk to computers? That's where a telephony server comes in.
A telephony server is like a computer program that helps phones and computers talk to each other. It's kind of like a translator. But not just any old translator, it's a special translator that makes sure that the phone and computer can understand each other perfectly.
An API or application programming interface is a set of rules and tools that software developers use to create new programs that work with an existing program. So, a telephony server API is a set of rules and tools that software developers use to create new programs that can talk to phones through the telephony server.
Imagine that you want to make a new app that lets people call their friends over the internet. You could use the telephony server API to make sure that your app can talk to phones through the server, just like any other phone call.
The telephony server API tells your app how to communicate with the server. It gives your app all the information it needs to make sure that there are no misunderstandings or problems when it talks to phones.
In summary, a telephony server application programming interface (API) is like a special translator that helps computers and phones talk to each other, by providing a set of rules and tools that software developers can use to make sure their apps can communicate with the telephony server properly.