I feel kind of dumb asking this questions. But I have a customer that does not want to dial 9 to get CO line. He wants prime line set to CO line group. But when I set the Prime line to CO Line group and make it hot. I cannot get back to the intercom for internal calls. I do not see option for a intercom button under Flexible button programming PGM 115.

Am I missing something?

Thanks for any help.
Sincerely, BB