Kindly advise if SM-X-8FXS/12FXO in C8300-2N2S-6T has 12 FXO ports inbuilt or we need to order 3 NIM-4FXO with each service module. Hence to connect 32 PSTN, we would need two SM-X-8FXS/12FXO with 3*2=6 NIM-4FXO to provide 24 FXO ports and then add ...