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Some buildings, such as offices, schools, business' etc have an internal phone system, to enable communication inside, without using the commercial phone system and therefore do not incur costs. This is a sort of intercom system, that uses normal wired phones. Calls to a phone may be from another phone within the building, or may be from someone calling from outside. This is an EXTERNAL call. This is called a Private Automatic Branch eXchange. PABX
In this system, the phone defaults to making internal calls. If you pick up the phone and dial a number, it will direct the call to someone else on the internal system. To make an outside (normal) call, you usually have to switch to an outside line (EXTERNAL). This is normally done by pressing '9' first (other numbers may be used), wait for another dial tone, then make your EXTERNAL call.
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