Thanx guys. I know about the improved keypad design. I asked because a guy called (supposedly an installer) and wanted a 10D. I only have the DP in stock right now and he told me that it was not compatible. My understanding is that it is completely compatible and, because of the flex circuit issue, preferable.
But I thought that I should double check to make sure that there wasn't some system out there that could not handle the DP.

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Intertel Telephone Repair
Toshiba Telephone Repair