The type of phone primarily determines its purpose and features:
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Stationary telephone. Also known as the landline phone.
It is the classic “home phone” which is most often installed in apartments for private use. This can be either a simple device with only purpose of making and receiving calls, or more complex device packed with features like display and an electronic notebook, a modern digital answering machine, a caller ID feature, etc.
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System phone. More complex and multifunctional devices that can programme office mini-PBXs, organize conferences, switch incoming calls to internal network numbers, etc. Such devices are most often used in large offices.
The number of telephone lines directly determines how many different telephone numbers can be "attached" to the device. Support for two or more lines can be a good solution for users who want, for example, to receive business calls on one number and personal calls on the second, but at the same time use only one telephone set. Each of the numbers in this case will have its own ringtone.
