[asterisk-users] Sip to ATA?

[Jacob Lefkowitz]

Yes, you would just plug the FXO ports directly into the cable modem and it 
would work.  In my experience the cable media gateways (Arris and Motorola) 
are more robust than VoIP ATAs.  They can provide polarity reversal on 
disconnect, can power a higher REN, and even have built-in batteries to keep 
the phones running when the power goes out (the battery only powers the 
phones, not the Internet connection).  YMMV based on your local cable co's 
implementation.