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Which speed tier are you subscribed to ?
The CM500V would basically be a direct replacement if you are using a 3939. It is an older model modem but as long as your speed-tier is below 300mbit you will be fine. If you have a 3.1 plan (usually gigabit) however it would not be compatible. Most systems are running 32-downstream channels though and the advantage of this is it allows your modem to switch around if there is congestion. I always say it is worth spending the extra money to help future-proof your equipment for a little longer. 16 will obviously work but it limits you down the road as far as what speeds are available to you.
The options are pretty limited as far as modems that support phone service so the model you picked out will work fine for you. There are a couple more expensive models from Arris but I doubt you would see any performance difference and they are about $100 more than the Netgear.
does the NETGEAR CM500V (16x4) DOCSIS 3.0 Cable Modem with Telephone Jack, Max download speeds of 680Mbps replace the cisco dpc3939 with voice?
In part. The CM500V is an eMTA (voice) modem only, and the DPC3939 is a gateway, which allows multiple devices to connect to the internet, plus it allows for wireless access also.
If you purchase the CM500V, then you should also purchase a wireless router if you want to have those features as well.
You can log into http://mydeviceinfo.xfinity.com to find approved devices that specifically support your speed tier and service level.