Press Feature, then 00 and it will tell you the extension, then Feature 00 again to back out. Also, you could try calling another extension and see what comes up on the display there.
If it doesn't have a display, then call an extension that does. It will show up on that extension as to who is calling. If you have no display phones, go off-hook on intercom and dial extensions starting with 10. When you get a busy tone versus a ring, you have found your extension. Test it by calling it from another phone.
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