Speakeasy VOIP help

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So i'm thinking of getting voip to replace my phone, but the problem is that speakeasy says that only 1 phone adapter per line is what you can do. That's fine if you have wireless phones, cuz then you just need one phyiscal phone jack, and then everything else is wireless. but how would i go about being able to keep my wires?

The reason being the guy said is that there isn't enough current for that one adapter to power more than one phone. He said there is some sort of booster i could get, but that wouldn't be supported by speakeasy, so i guess if i have a problem with it, they offer me no technical support. Anybody know where to find these boosters? i see RCA has this wireless phone jack, but that doesn't seem like the right thing, that just takes a phone signal, makes it wireless, then brings it back, so you don't need to do any wiring. does that also boost the signal?

Help is appreciated

Thanks.