If you put it in group 1 but 9 still goes to line 9 then you have some other issue (unless you didn't save it to group 1) if the line is group 2 and the phone extension doesn't have access to group 2 you will not be able to call out on the line. I take it there are no loop keys on the phones either.

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"Old phone guys never die, they just get locked in some closet with an old phone system and forgotten about"

Retired, taking photographs and hoping to fly one of my many kites.