🚀 go-pugleaf

barrett@opera.iinet.net.au (Barrett Communications) wrote:
>I am looking for means of determining if a person has picked answered a
>phone (normal analogue).  
>
>As far as I know there are three means for
>determining if the phone has been answered.  The first two I have covered,
>the last I no nothing about.  
>
>


[snip]
  
>
>3) Line Reversal?  There is meant to be a
>polarity change on the tip and ring inputs as soon as the phone is picked
>up?  Does anyone know anything about this and/or how to measure it?  Also
>may not be available in all countries?  
>
>Any help appreciated,
>
>Damian


Try having a look in the old in BS6450:Part 1 spec.

I believe it used to talk about (I may be wrong !) 
something yo do with an answer signal returned 
from the exchange, so that a
PBX knew that the outgoing call had been answered. Is this the
sort of thing you are looking for ? Or do you want to
know if an incoming call was answered succesfully
before the caller gave up and hung up ?

If the latter is true, I would be interested in hearing
a way of doing it, if you find you are successful.

Simon Watkins        email simon_watkins@nt.com