I have a UC500 with two 4-port FXS cards. The 4 ports on the first card were automatically setup and ephones were configured using the MAC address of the first card. Now I want to use the FXS ports on the 2nd card but I don't know how to get the MAC addresses for the second card. When I do "sho stcapp device summ" I only see the first four ports. What do I need to do here?