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Re 3600HGV Residential Gateway: What is the RJ jack marked "Phones, Aux Line" used for?

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Re 3600HGV Residential Gateway: What is the RJ jack marked "Phones, Aux Line" used for?

 
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Re: Re 3600HGV Residential Gateway: What is the RJ jack marked "Phones, Aux Line" used fo

A second voip ... voice over internet protocol. .. phone line.

Some units such as 3600 and 3800 have two separate jack plugs for 2 voip lines while other RGs such as 3801 and 589 have 1 jack plug with inner pair as line 1 and outer pair as line 2.
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