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In residential telephony, an extension telephone is an additional telephone wired to the same telephone line as another. In middle 20th century telephone jargon, the first telephone on a line was a "Main Station" and subsequent ones "Extensions" or even called as intercom.
Telephone numbers in Indonesia have different systems for land lines and mobile phones: land lines use area codes, while mobile phones do not.. For land line area codes, the digit "0" is added in front when dialing domestic long distance from within Indonesia, but is always omitted when calling from abroad.