if your video/voice is being compressed as it is sent to the recipient hosts, which it most likely is, then the answer would be NO, you cannot bypass the DSP as it is required to transcode to g.711 and vice versa.
if you're video/voice is not being compressed throughout any part of the network, then the DSPs would not be required as the codec would remain the same end-to-end.
see if you have the possibility of using a single specific codec end-to-end, if you can, a DSP would not be required.
I have to disagree. Even with G711, and no requirement for conferencing or transcoding, you need DSPs on gateway routers for echo cancellation and fax/modem calls. Use the DSP calculator for confirmation:
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