How to “unconfigure” voicemail from Panasonic KX-TD308?

In our house, we have a Panasonic KX-TD308 with a KX-TVS50 “Voice Processing System” and we just moved our phone to Google Voice. I have it hooked up via an obihai ATA to the D308, but we have Google Voice handling the voicemail now. I have changed call coverage settings (day + night) so that calls no longer go to the TVS50, but is there more I need to do, or can do, to be able to actually disconnect the VPS from the PBX? Would like to get rid of it, rather than having it draw current for no reason. But also sort of want to ensure the PBX remains “happy” for now…

submitted by /u/tastewar
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