Given the specifications or hardware requirements for your router platform there are insufficient DSPs as you already know, and the output suggest you require 2 additional DSPs.
For you information a single PVDM2-48 supports 3 DSPs and in order to support your configuration of 2 E1 Pri trunks and 3 4-Port FXO modules you will require 5 DSPs in total for FLEX complexity, this is the absolute minimum.
Therefore in order to utilise you exiting PVDM2-48 you will require additional 32 voice-channels, the PVDM combinations are broken down as follows. I believe 2851 support 3 PVDMS:-
one PVDM2-64 + one PVDM2-8
two PVDM2-32 + one PVDM2-8
one PVDM2-16 + one PVDM2-48 + one PVDM2-8.
If you have on a single PRI trunk then a PVDM2-48 would be sufficient for a single E1 and 12 FXO ports. This is not including any harward transcoding/conferencing, if you require such resource then you will definately require additional PVDMs.
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