Read the forum guidelines
Would it be possible to use an ethernet based telephone VoIP adapter with Cox Voice? Or do you need to use a coax phone modem? If the phone modem is required and I buy a docsys 3.1 from the cox certified list, will Cox be willing to activate it for voice?
You will need to use Cox's voice modem for telephone service. You can use your OWN modem for Internet, which is what I do, I have a Cox DPC3212 modem for telephone service and I use my personal DG2460 modem for Internet, though I will be upgrading soon.