never tested. might not work.

dialplan.rb

require 'rubygems'
require 'dm-core'
require 'ftools'

incoming do
  iv = new_instant_vox
  iv.handle_call
end

instant_vox.rb

# lib/components/instant_vox/lib/instant_vox.rb

class InstantVox
  add_call_context :as => :call

  def initialize
    @sound_path = File.join(File.dirname(__FILE__), '../sounds')
    @vox = Vox.create
  end

  def handle_call
    call.hangup unless @user = User.get(:extension => call.extension)
    record
    menu
  end

  def record
    call.play 'record-after-beep'
    @tmp_vox = call.record
    failure unless File.exists?(tmp_vox)
  end

  def menu
    call.play 'menu'
    case call.input(1, :timeout => 20.seconds)
    when 1
      if File.move(@tmp_sound, File.join(@sound_path, "#{@vox.id}.gsm")) 
        goodbye
      else
        failure
      end
    when 2
      call.play @tmp_sound
      menu
    when 3
      record
      menu
    end
  end

  def failure
    @vox.destroy
    call.play 'failure'
    call.hangup
  end

  def goodbye
    call.play 'goodbye'
    call.hangup
  end
end