CCNA Voice Study – Integration Models

PBX– Traditional model, phones all have a unique DN perhaps DIDs. Calls come into a receptionist for direction and users must use an access digit of sorts like 9.

Keyswitch – Model in which all phones have a common lines on all of them. All users can see when a line is in use and intra-office calls are rare.

Hybrid– All phones have common lines in addition to a unique one.

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