Extension is a private telephone system. O name it is in reference to a tree. That's because there is a trunk, and its branches, its branches.
So, this way the extension works! There is its central, and its branches. Namely, your internal phone lines. Therefore, in many hospitals, or large companies, we first call the central, and from there we are forwarded to the specific area.
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There are differences between telephone extensions and extensions. In the extensions, the devices are connected by cabling at all points, on the same line.
As such, they are all interconnected and not private. Therefore, any device can get the call that is happening on the other connected device.
In branch lines this does not happen. This is because they are private, even interconnected in the same central. In this way, a single telephone line can have multiple extensions.
