Any one ever heard of a three line 6 station system ringing on all phones and all lines stops ringing when two calls come in at once and the first one is answered? If you call any of the three lines they ring on all 6 phones. Only when two lines are ringing in and one is answered the second does not continue to ring on any set. I reprogramed each line and three of the sets but still does the same thing. If you call each line individualy all 6 sets ring on all three lines. This hapens on all combinations of lines...1-2, 2-3, and 1-3. The system also has Norstar Flash VM but the problem is before it hits the VM. Thanks in advance for any ideas.