Is it possible-Yes, but it is not recommended. Usually solutions are desiged around hardware DSP resource at the remote sites and software resources at the Main site. Here is media resources chapter from Cisco SRND.
If you configure the DSP farm as you normally would and register it as a transcoder. That will be assigned to a media resource group (MRG) and that assigned to all the phones. Not sure if this is what you mean but that would mean all the phones use all the same resources.
I think the reason DSPFarms arent recommended is because the call will Unnecessary cross the wan.
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