Interestingly, I just had this conversation over lunch. My experience has been that even though the FXO card theroretically only needs 4 channels, it allocates all resources on that 16 channel DSP SIMM. You will need a second DSP SIMM to allocate channels for conferencing, transcoding, etc.
Another problem with this config is that the PVDM2-16 is only 1 dsp, and conferencing requires a reserved dsp:
PVDM2-16 16-Channel Packet Fax/Voice DSP Module
1 DSP (TI 2510)
Q. Can conferencing share the resources with transcoding or voice calls of a single DSP?
A. No. Conferencing needs a dedicated DSP resource. If a DSP is assigned for a conferencing session, then it cannot be used for transcoding or voice call initiations or terminations. Transcoding and voice calls can share the resource of a single DSP, however. Note that conferencing needs a dedicated DSP, but not a dedicated PVDM2 module. For example, PVDM2-64 contains 4 DSPs; if one of them is used for conferencing, the other three can still be used for other purposes.
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