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i2022 ISDN Teleset
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The Teleset will light the appropriate Call Appearance keys and display the DN assigned to them. This is helpful when
checking Multiple Call Appearances or labeling the Teleset.
PROTECTING KEYS FROM BEING OVERWRITTEN
(This procedure is not necessary On 5ESS Custom ISDN or firmware versions dated K121003 or newer.)
Once the Teleset has been completely programmed, it is possible for the serving switch to change the Teleset’s
programming. This feature is called Auto-Parameter Downloading. Like all features, there are pluses and minuses to it.
On the plus side, the Teleset will always be in agreement with the switch. On the minus side, the switch can erase Speed
Dial keys, remapped keys, etc. without the user’s knowledge.
There are two different methods for protecting the Programmable Hardkeys. The first is to disable the automatic
download. The second is to allow the automatic download but protect the keys on a key-by-key basis.
Disabling the Automatic Download
To prevent the switch from changing any keys by preventing an Automatic Parameter Download, press MENU and then
dial 99 on the touchtone keypad.
Press Disable.
Protecting specific keys from an Automatic Download
To prevent the switch from changing any keys on a key-by-key basis, press MENU and then dial 99 on the touchtone keypad.
Press SelKey. The display prompts you to “Select Keys to Protect”.
Select the Programmable Hardkeys to protect by pressing each of them. When selected, they will light green.
Press Save.