Typically the CPE address is private, not sure why they would use a public IP. The MTA (VoIP) part of the modem would need a public IP if it was talking to a SIP server that was not on the same network. Most smaller cable system outsource their VoIP to a reseller with a softswitch.
---- ---- ---- ---- Chris Gotstein, Sr Network Engineer, UP Logon/Computer Connection UP http://uplogon.com | +1 906 774 4847 | ch...@uplogon.com On 1/28/2010 7:44 AM, Joakim Aronius wrote: > * Paul Stewart (pstew...@nexicomgroup.net) wrote: >> That really makes sense - on an incredibly smaller scale (and I mean MUCH >> smaller scale), we operate cable modem in two small communities - currently >> we use 3 IP addresses per subscriber. One for the cable modem itself, one >> for the subscriber (or more depending on their package), and one for voice >> delivery (packetcable). If we moved even two of three IP assignments to >> native V6 we'd reclaim a lot of V4 space - I can only imagine someone their >> size and what this means... >> >> Paul > > Excuse the newbie question: Why use public IP space for local CPE management > and VoIP? Doesn't DOCSIS support traffic separation? > > /J >
