To change the dial 9 group on a prostar 816 you first need to be at a display set (doesn't matter what the extension number is).
with the handset down enter #20 the screen should say MMC DISABLED
1) enter in 1 2 3 4 1 # (that enables programming)
2) enter in #47 the screen should say DIAL 09 GROUP and then 11111111 1= in group 0= not in group
3)enter 11000000 for lines 1 and 2 in dial group 9
4) press # when finished
Testimonial: "Worked perfectly. Thank you!"
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