my detail is bellow.
i am using asterisk 1.8.13

_______________________________________________________________________________
 File: /etc/asterisk/extensions.conf
[call]
exten => call,1,Answer
exten => call,n,Playback(hello-world)
exten => call,n,Hangup()

exten => h,1,Set(NEXT=$[${NEXT}+1])
exten => h,n,AGI(generateCall.php,${NEXT})
exten => h,n,Hangup()
_______________________________________________________________________
File: /usr/share/asterisk/agi-bin/generateCall.php

#!/usr/bin/php -q
<?php
$fileName = "/var/www/consumer.txt";
$next = $argv[1];
$f = fopen($fileName,'r');
$fileContent = file_get_contents($fileName);
$outdialNumbers = explode("\n",$fileContent);

if($outdialNumbers[$next]) {
        $callFile       = "/var/spool/asterisk/outgoing/".$outdialNumbers[$next].".call";
        $f              = fopen($callFile,'w');
        $callFileContent        = "\nChannel: dongle/dongle0/".$outdialNumbers[$next]."\nContext: call\nExtension: call\nPriority: 1\nSet: NEXT=".$next."\n";
        fwrite($f, $callFileContent);
        fclose($f);
        chmod($callFile, 0777);
}
?>
____________________________________________________________________________
mac@almighty ~ $ ls /usr/share/asterisk/agi-bin/ -l
total 4
-rwxrwxrwx 1 root root 1166 Feb 20 15:48 generateCall.php
____________________________________________________________________________
mac@almighty ~ $ ls /var/spool/asterisk/ -l
total 28
drwxrwxrwx 2 root users 4096 Sep 13 06:59 dictate
drwxrwxrwx 2 root users 4096 Sep 13 06:59 meetme
drwxrwxrwx 2 root users 4096 Sep 13 06:59 monitor
drwxrwxrwx 2 root users 4096 Feb 20 20:39 outgoing
drwxrwxrwx 2 root users 4096 Sep 13 06:59 system
drwxrwxrwx 2 root users 4096 Sep 13 06:59 tmp
drwxrwxrwx 2 root users 4096 Sep 13 06:59 voicemail
mac@almighty ~ $
____________________________________________________________________________
almighty*CLI>
[Feb 20 20:39:32] WARNING[2007]: pbx_spool.c:278 safe_append: Unable to set utime on /var/spool/asterisk/outgoing/9033544852.call: Operation not permitted
    -- Attempting call on dongle/dongle0/9033544852 for call@call:1 (Retry 1)
       > Channel Dongle/dongle0-010000000d was answered.
    -- Executing [call@call:1] Answer("Dongle/dongle0-010000000d", "") in new stack
    -- Executing [call@call:2] Playback("Dongle/dongle0-010000000d", "silence/1") in new stack
    -- <Dongle/dongle0-010000000d> Playing 'silence/1.gsm' (language 'en')
    -- Executing [call@call:3] Playback("Dongle/dongle0-010000000d", "hello-world") in new stack
    -- <Dongle/dongle0-010000000d> Playing 'hello-world.gsm' (language 'en')
    -- Executing [call@call:4] SayDigits("Dongle/dongle0-010000000d", "0") in new stack
    -- <Dongle/dongle0-010000000d> Playing 'digits/0.gsm' (language 'en')
    -- Executing [call@call:5] Hangup("Dongle/dongle0-010000000d", "") in new stack
  == Spawn extension (call, call, 5) exited non-zero on 'Dongle/dongle0-010000000d'
    -- Executing [h@call:1] Set("Dongle/dongle0-010000000d", "NEXT=1") in new stack
    -- Executing [h@call:2] AGI("Dongle/dongle0-010000000d", "generateCall.php,1") in new stack
    -- Launched AGI Script /usr/share/asterisk/agi-bin/generateCall.php
<Dongle/dongle0-010000000d>AGI Tx >> agi_request: generateCall.php
<Dongle/dongle0-010000000d>AGI Tx >> agi_channel: Dongle/dongle0-010000000d
<Dongle/dongle0-010000000d>AGI Tx >> agi_language: en
<Dongle/dongle0-010000000d>AGI Tx >> agi_type: Dongle
<Dongle/dongle0-010000000d>AGI Tx >> agi_uniqueid: 1361372972.13
<Dongle/dongle0-010000000d>AGI Tx >> agi_version: 1.8.13.1~dfsg-1
<Dongle/dongle0-010000000d>AGI Tx >> agi_callerid: unknown
<Dongle/dongle0-010000000d>AGI Tx >> agi_calleridname: unknown
<Dongle/dongle0-010000000d>AGI Tx >> agi_callingpres: 0
<Dongle/dongle0-010000000d>AGI Tx >> agi_callingani2: 0
<Dongle/dongle0-010000000d>AGI Tx >> agi_callington: 0
<Dongle/dongle0-010000000d>AGI Tx >> agi_callingtns: 0
<Dongle/dongle0-010000000d>AGI Tx >> agi_dnid: unknown
<Dongle/dongle0-010000000d>AGI Tx >> agi_rdnis: unknown
<Dongle/dongle0-010000000d>AGI Tx >> agi_context: call
<Dongle/dongle0-010000000d>AGI Tx >> agi_extension: h
<Dongle/dongle0-010000000d>AGI Tx >> agi_priority: 2
<Dongle/dongle0-010000000d>AGI Tx >> agi_enhanced: 0.0
<Dongle/dongle0-010000000d>AGI Tx >> agi_accountcode:
<Dongle/dongle0-010000000d>AGI Tx >> agi_threadid: 1129301104
<Dongle/dongle0-010000000d>AGI Tx >> agi_arg_1: 1
<Dongle/dongle0-010000000d>AGI Tx >>
<Dongle/dongle0-010000000d>AGI Rx << Could not open input file: 1
<Dongle/dongle0-010000000d>AGI Tx >> 510 Invalid or unknown command
    -- <Dongle/dongle0-010000000d>AGI Script generateCall.php completed, returning 0
[Feb 20 20:39:44] NOTICE[2672]: pbx_spool.c:366 attempt_thread: Call completed to dongle/dongle0/9033544852
almighty*CLI>