Meaning of extension

[Siamm]

English Language Tests, Intermediate level

ESL/EFL Test #724 "Real Life: Talking on a Business Phone (1)", question 10

Do I have the right extension? I'm looking for accounts receivable. .........

(a) Yes, you sure do. How can I help you?
(b) She's out for lunch right now.
(c) Yes, please have her call me as soon as possible.

English Language Tests, Intermediate level

ESL/EFL Test #724 "Real Life: Talking on a Business Phone (1)", answer 10

Do I have the right extension? I'm looking for accounts receivable. Yes, you sure do. How can I help you?

Correct answer: (a) Yes, you sure do. How can I help you?
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extension what it means?

Siamm

[Mister Micawber]

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'An additional telephone set that is connected to the same telephone line'.
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Native English teacher at Mister Micawber's