Verbose() — Sends arbitrary text to verbose output
Sends the specified message to
      verbose output. The level must be an integer
      value. If not specified, level defaults to
      0.
exten => 123,1,Verbose(Somebody called extension 123)
exten => 123,2,Playback(extension)
exten => 123,3,SayDigits(${EXTEN})The optional argument level is not so
        optional, if you include the delimiter | in your invocation of Verbose(). If the delimiter is found,
        Verbose() assumes that you meant to
        specify level (and chops off everything
        preceding the initial |). It is
        therefore probably best to get in the habit of always specifying the
        level.