From: lfsheldon@gmail.com   
      
   On 7/1/2014 3:06 PM, Larry Sheldon wrote:   
   > On 7/1/2014 4:59 AM, rcp27g@gmail.com wrote:   
   >> On Monday, 30 June 2014 19:05:00 UTC+2, Stephen Sprunk  wrote:   
   >>   
   >>> I'm not aware of any mobile phone (Nokia or otherwise) with   
   >>> multiple line support.   
   >>   
   >> Every mobile phone I have owned, since the late 1990s, has supported   
   >> "call waiting".  When someone calls you while you're on the phone, it   
   >> makes a noise "in call", and allows you to put the current call on   
   >> hold, deal with the new incoming call, and resume the previous call   
   >> once the incoming one is finished.  Personally I don't have enough   
   >> phone traffic to make it a feature I need, but I know it's there.   
   >   
   > It is probably not a difference worth dying for but to me "multiple   
   > lines" implies multiple directory numbers (and in some sense or other,   
   > multiple facilities*) and a whole different model from "call waiting"   
   > and "conferenceing"  which are protocols for signalling to the switch   
   > that you want the call currently on the single "line" put on "hold" at   
   > the switch and either the waiting inbound call, or an originating   
   > register connected to that single line.   
      
      
   Forgot something...   
      
   *in the old days, a copper pair** at the connecting block, in digital   
   days (probably) a separate digital stream.   
      
   **which was NOT necessarily a copper pair back to the CO--might have   
   been a separate pair-gain carrier channel, a separate phantom, or a   
   separate path through a concentrator.   
      
      
      
   --   
   Idioten aangeboden. Gratis af te halen.   
   h/t Dagelijkse Standaard   
      
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