To add the 1140 expansion module to a phone, you'll need to LD 11 change (easy chg) the set's TN programming to at least: KEM 1
...likely in addition to having CLS KEM3.
Easy way to remember: KEM (Key Expansion Module). KEM 1 (or 2) enables up to 79 keys.
With the Shift button, I now have a...
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