It seems that on my original post I was thinking about this problem all wrong.

It is probably better to have a piece of hardware that is attached RJ45 [ethernet] on one side and produces RJ11 'regular phone' on the other side. That way I can attach a generic cordless phones.

I have not added antoher post comparing the services Vonage, Broadvoice, Voicepulse.

I will then need to know what hardware does the conversion stated above better, plus perhaps a foward and IP call to a cell phone using a local exchange.

Thanks.