sub_accountlist_calls.rb

require 'rubygems' # not necessary with ruby 1.9 but included for completeness
require 'twilio-ruby'

# put your own credentials here

account_sid = 'ACxx'
auth_token = 'xx'


# set up a client
@client = Twilio::REST::Client.new(account_sid, auth_token)
@account = @client.account

totalaccounts = 0 #total subaccoutns we go through

subaccounts = @client.accounts.list

begin
    subaccounts.each do |subaccount|

        
        friendly_name = subaccount.friendly_name
        totalaccounts = totalaccounts +1
        if subaccount.status == "active"
            #puts "getting subaccount #{friendly_name} #{subaccount.sid}, #{subaccount.auth_token}, #{subaccount.status}"
            @subaccountclient = Twilio::REST::Client.new subaccount.sid, subaccount.auth_token

            calls = @subaccountclient.account.calls.list(  "start_time>" => '2016-08-30', "start_time<" =>  '2016-08-31')
            begin 
                calls.each do |call|
                    puts  call.account_sid + ","  + friendly_name  + ","  + call.start_time + "," + call.status + "," + call.sid 
                end
                calls = calls.next_page
            end while not calls.empty?
         end  #if acttive

      end
    subaccounts = subaccounts.next_page
end while not subaccounts.empty?