Yes they do. [Thanks to tetskionDSL

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Earthlink Line Powered Voice --- ZyXEL Problem quote:
If you want to get support for LPV, the number to call is 1-877-356-5864 Press Option 1 and then Press Option 3 for Technical support for LPV. You'll get to an Omaha Center that can check everything (for voice and dsl) for you.
NOTE: The new service bundle uses ADSL2+ only and you will need the Earthlink supplied ADSL2+ modem to connect unless you have your own ADSL2+ ready Modem. A standard ADSL Modem will NOT work. As of 2006/2007 the ZyXEL P660R-61/P660R-ELNK are the only two ADSL2+ Modems provided by Earthlink. None of the earlier modems from Earthlink can support ADSL2+.
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got feedback?by Doctor Olds 
last modified: 2007-03-22 15:06:54