More info needed. Are the lines ringing a hunt group with the 3 phones? If so, check flash 30 settings for overflow destination and vmid (if used). If the lines ring the 3 phones and overflow to auto attendant, check flash 40 settings for preset call forwarding destination for day, night, and special. Was the system accidentally put into night or special mode? Like I said in the opening, more info needed.

"I thought I was wrong once, but I was mistaken"