Definition. Refers to another code defined within the code system that is also subsumed by this code. I.e. This concept subsumes the referenced concept. Because meaning is inferred from hierarchy as well as definition, the presence of this extension modifies the meaning of the extended concept.

What is meant by extension number?

An extension is a three to six-digit number identifying a specific call path configuration that allows you to dial and connect to another caller internally. This is not a DID phone number but rather an internal extension.

How do I find my extension number?

How do I find out my Norstar extension number?
Put your handset down on the rest.Press Feature * 0.You’ll see Key Inquiry and then press a key in your display.Press any intercom button.You’ll see your extension number in your display.Press any programmable button.

Dialing an extension number
After dialing the main number, press and hold * . A comma ( , ) is added to the number you are dialing. After dialing the main number, press and hold# to add a semicolon ( ; ). Enter the extension number after the semicolon , and then tap the call button.