From: stephen@sprunk.org   
      
   On 21-Jun-14 22:33, hancock4@bbs.cpcn.com wrote:   
   > On Friday, June 20, 2014 4:45:19 PM UTC-4, mrob...@att.net wrote:   
   >> Well, 48 V at the exchange. Maybe 5 V by the time it gets all the   
   >> way out to your off-hook telephone. :)   
   >   
   > FWIW, I used a volt meter on my phone line and it was 48 volts.  Of   
   > course, I live only a mile from the C.O., maybe people further out   
   > have a lower amount.   
   >   
   > I have no idea what the voltage/currents are on VOIP phone lines.   
      
   On the POTS side, both should be the same as a real POTS line.   
      
   On the IP side, it's whatever the relevant IP technology uses, but in   
   general the longer the wires it's intended to run over, the higher the   
   voltage (at least at the source) will be.  Most use differential or   
   alternating signaling so the net current is zero.   
      
   S   
      
   --   
   Stephen Sprunk         "God does not play dice."  --Albert Einstein   
   CCIE #3723         "God is an inveterate gambler, and He throws the   
   K5SSS        dice at every possible opportunity." --Stephen Hawking   
      
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