I think the Arris modem number you gave can handle Comcast voice (phone), as well as internet. We are just now retiring our Motorola SB5101 which we'd used for years for internet only. Comcast offered us a good deal for both internet and phone, but our Motorola modem only works for internet/TV. We are renting Comcast's Arris modem for a few months to see if we like their phone. If we do, we'll make plans to buy one.
You can view their accepted modems on their website. I googled "Modems accepted by Comcast" or something like that to get to the proper page. Apparently, the SB5101 is considered old technology now and will eventually have to be replaced anyway.
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