The short answer is no. You can not Disable the sleep on the backlight of the phones.
You can extend the time out. If I rememeber correctly the max you can set it to is 60 mins. The seeting is in the config file for the phones on the server. You have to change the file and then reboot the phone.
The backlight sleeping was added because the led in the phone burn out over time (about 18 months). Thats on of the main reasons the 230 does not have a backlight.
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