An additional telephone set that is connected to the same telephone line.
1A telephone extension was run into the building.
2Eventually he was connected with a lady who said that she didn't know Mr. Hooper's telephone extension number.
3The telephone extension bell rang.
4Often, the phreaker was greeted by an automated message asking for the employee's telephone extension-whichalso served as the password.
5She had two extra telephone extensions in her home and called the telephone company to remove them.
6The software can handle between 20 and 50,000 telephone extensions, and is used by more than 25,000 organisations worldwide.
Translations for telephone extension