Hi There
There are a number of POTS/Voice over ethernet [I use them over fiber to carry POTS thru HEMP shields - where copper cabling is verboten].
Try RAD as a start: http://www.rad.com/Article/0,6583,21697-Data,Voice,Fax_and_LAN_Integrating_Multiplexers,00.html
Also: www.lascomm.com has a...
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