I have a partner ACS r6 with a 308EC expansion card. For some odd reason everytime the phones ring any extension with a button programmed for ext 21 starts winking the light for ext 21. The only exception is if I actually answer the call from 21. The only way it seems for me to stop the winking is to unplug the station cable from the module going to station 21. FWIW its three fast winks, a pause and three fast winks, repeating ad-nauseum. Any thoughts?