def voice_regions
      return @voice_regions unless @voice_regions.empty?

      regions = JSON.parse API.voice_regions(token)
      regions.each do |data|
        @voice_regions[data['id']] = VoiceRegion.new(data)
      end

      @voice_regions
    end
def voice_regions
      return @voice_regions unless @voice_regions.empty?

      regions = JSON.parse API.voice_regions(token)
      regions.each do |data|
        @voice_regions[data['id']] = VoiceRegion.new(data)
      end

      @voice_regions
    end
Returns or caches the available voice regions