can you please clarify this scenario:
i have an ISR4321-V/K9 and NIM-4FXO=
and our Future plan to have E1 cable, and increase the number of phone cables.
i know that FXO card with ISR4321, we do not need to add PVDM module, because new FXO cards have on board DSP.
can you Please Clarify if we need an PVDM module ???
and thanks a lot
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