Hello there,

  I want to share 16 "internal" telephone to 4 "external" telephone lines.
The internal phones will only try to get one external line, as to make a
communication to the outside world, but want ever try to communicate to
another internal phone.
  I will also have to know how much time did that communication last, and
wich number was dialed.
 So, here comes the question:

   Does anyone know wich analog circuits would simplify my job ? (DTMF
dialer, etc, etc)

   Hope to receive help,


               Gabriel Caffese.-

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