On Monday, June 23, 2014 3:20:35 PM UTC-4, Stephen Sprunk wrote:   
      
   > "Digital" PBX lines typically use POTS-style analog on the first pair   
   > for the voice path plus digital signaling on the second pair.  This   
   > enables numerous features not available with analog signaling.   
      
   Could you elaborate on the extra features available with digital signalling?   
      
   Would you know when this became widely available?  I think some people have   
   had it for many years.   
      
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