I'm working on an install with a UC540W with 8 FXO ports and a set of 9 SPA501G phones. The customer would like to have the 501Gs set up in key system mode with each of the 8 buttons associated with a different C/O line. When I set it up in the Telephony wizard and come to FXO port allocation, I don't have the ability to check boxes and add different CO lines to each of the telephone handsets. I also cannot seem to add this functionality under User extensions in the voice configuration. What am I missing?
Thanks in advance,