How many Voice connections can cisco 2821 support?

Good day.
I have a cisco 2821 with EVM slot, NME-X slot and two HWIC slots. I have 4 port FXOs on the two HWIC slots. The EM-HDA-8FXS module on the EVM slot can handle 8 FXS connections. Please i would like to know if there is an EVM module that can do FXO connections and also how many voice connections can this router handle in total. Can the EM-HDA-8FXS module handle both FXS and FXO connections?
Hope someone can help me out. My deadline has already passed.
Regards,
Obinna.

Hi, already replied to this in the appropriate forum.
Please do not open duplicate threads.

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