Ok but you need to do that at every extension, ie remove them all from the group except 1 extension and try it.Do you know how to do keyset programming? Maybe there is a next set in the 501 group. Is there a voicemail system installed?
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Well, ended up finding a resolution. He had a all in one modem providing phone and internet and that device wasnt working with system. Provider swapped to a arris phone device and it works now /shrug
