[a2billing-did]
exten => _X.,1,AGI(a2billing.php,1,did)
exten => _X.,n,Hangup()

[a2billing-out]
exten => _X.,1,AGI(a2billing.php,1)
exten => _X.,n,Hangup()

Add custom destinations to FreePBX via FreePBX GUI>Admin>Custom Destinations

These destinations are referring to the custom extensions created above in /etc/asterisk/extensions_custom.conf

Target: a2billing-did,${EXTEN},1 
Description: A2Billing - Inbound

Target: a2billing-out,${EXTEN},1 
Description: A2Billing - Outbound

Create inbound route

We are creating a universal DID inbound route.  This requires _. in the DID number field.  That is underscore character followed by period or dot character. 

Connectivity > Inbound Routes

Description: Some descriptive name

DID number: _.

Set Destination: Custom Destinations
                               A2Billing - Inbound

Start or restart FreePBX

fwconsole restart

Cron

Copy cron files to some permanent location such as /usr/local

mkdir -p /usr/local/a2billing
cp -R /usr/src/a2billing/Cronjobs /usr/local/a2billing/
ln -sf /var/www/html/a2billing/common/lib /usr/local/a2billing/Cronjobs/lib
chown -R asterisk. /usr/local/a2billing

Add the cron jobs to /var/spool/cron/asterisk as follows

crontab -e -u asterisk

# update the currency table
0 6 * * * php /usr/local/a2billing/Cronjobs/currencies_update_yahoo.php

# manage the monthly services subscription
0 6 1 * * php /usr/local/a2billing/Cronjobs/a2billing_subscription_fee.php

# Check the account of each user and send an email if the balance is below mimimum.
0 * * * * php /usr/local/a2billing/Cronjobs/a2billing_notify_account.php

# Browse all the DID's that are reserved and check if the customer need to pay.
# Bill them or warn them via email that they need to pay in order to keep their DIDs.
0 2 * * * php /usr/local/a2billing/Cronjobs/a2billing_bill_diduse.php

# This script will take care of the recurring service.
0 12 * * * php /usr/local/a2billing/Cronjobs/a2billing_batch_process.php

# Generate invoices and for each user
0 6 * * * php /usr/local/a2billing/Cronjobs/a2billing_batch_billing.php

# Process the autodialer.
*/5 * * * * php /usr/local/a2billing/Cronjobs/a2billing_batch_autodialer.php

# Manage alarms
0 * * * * php /usr/local/a2billing/Cronjobs/a2billing_alarm.php

# Manage archive
0 12 * * * php /usr/local/a2billing/Cronjobs/a2billing_archive_data_cront.php

#Autorefill
0 10 21 * * php /usr/local/a2billing/Cronjobs/a2billing_autorefill.php
15 * * * * php /usr/local/a2billing/Cronjobs/a2billing_batch_cache.php

Add log files

mkdir -p /var/log/a2billing

touch /var/log/a2billing/cront_a2b_alarm.log
touch /var/log/a2billing/cront_a2b_autorefill.log
touch /var/log/a2billing/cront_a2b_batch_process.log
touch /var/log/a2billing/cront_a2b_archive_data.log   
touch /var/log/a2billing/cront_a2b_bill_diduse.log   
touch /var/log/a2billing/cront_a2b_subscription_fee.log   
touch /var/log/a2billing/cront_a2b_currency_update.log   
touch /var/log/a2billing/cront_a2b_invoice.log   
touch /var/log/a2billing/cront_a2b_check_account.log   
touch /var/log/a2billing/a2billing_paypal.log
touch /var/log/a2billing/a2billing_epayment.log
touch /var/log/a2billing/a2billing_api_ecommerce_request.log
touch /var/log/a2billing/a2billing_api_callback_request.log
touch /var/log/a2billing/a2billing_api_card.log
touch /var/log/a2billing/a2billing_agi.log

chown -R asterisk. /var/log/a2billing

Add index file to prevent browsing of folders

touch /var/www/html/a2billing/index.html

Log into the webpage

http://{my-ip-address}/a2billing/admin

• user:  root
• pass: mynewpassword

Or use default password changepassword if you have not changed it yet and then click the change password link at the bottom left.

Set Asterisk version in A2Billing

Go into System settings>Global list.  Go to the bottom left and set to display all.  From your web browser search for "asterisk_version".  It will find that setting twice.  One for Global group and one for agi-conf1 group.  Change both accordingly.  If using Asterisk v11 or v13 then use "1_11"

Disable Asterisk Realtime if not setting up the following Asterisk Realtime procedure. Go to System settings>Global search for "realtime".  Change that setting to "no".

Asterisk Realtime

If using Asterisk Realtime you do not need to reload every time you add/remove/change a customer.  It also allows you to share the A2billing database between multiple Asterisk/Freepbx servers.  If you need to create many customers it makes more sense to use a database rather than a flat text file.

Double check you have the Asterisk Realtime module installed. 

cd /usr/lib64/asterisk/modules
dir

There should be a file there called res_config_mysql.so.  If not you need to re-compile Asterisk and set it to compile the res_config_mysql.so realtime module in menuselect.

Add the following to /etc/asterisk/extconfig.conf

nano /etc/asterisk/extconfig.conf

NOTE: [settings] is already included and uncommented in this file in asterisk sample configurations.  So if you installed asterisk samples or Freepbx and this file already exists and you are trying to add to it, do not add this line twice.

[settings]
iaxusers => mysql,general,cc_iax_buddies
iaxpeers => mysql,general,cc_iax_buddies
sipusers => mysql,general,cc_sip_buddies
sippeers => mysql,general,cc_sip_buddies

Add the following to /etc/asterisk/res_config_mysql.conf

nano /etc/asterisk/res_config_mysql.conf

NOTE: [general] is already included and uncommented in this file in asterisk samples.  So if you installed asterisk samples or Freepbx and this file already exists and you are trying to add to it, do not add this line twice.

[general]
dbhost = 127.0.0.1
dbname = mya2billing
dbuser = a2billinguser
dbpass = a2billing
dbport = 3306
;dbsock = /var/lib/mysql/mysql.sock

Assuming (as we did in this guide) that the dbname=mya2billing, dbuser=a2billinguser, dbpassword=a2billing.  Double check that these settings match /etc/a2billing.conf and substitute as necessary.

Now restart freepbx/asterisk

fwconsole restart

To check if realtime is working:

From Asterisk CLI>

Should produce:

Config Engine: mysql
===> iaxpeers (db=general, table=cc_iax_buddies)
===> iaxusers (db=general, table=cc_iax_buddies)
===> sippeers (db=general, table=cc_sip_buddies)
===> sipusers (db=general, table=cc_sip_buddies)

After you add a customer to A2Billing, and assuming that customer's account number is, for example, 1234567890

should produce:

Column Name  Column Value
-----------  ------------
id           1 
id_cc_card   1 
name         1234567890
accountcode  1234567890
regexten     1234567890
amaflags     billing
callgroup
callerid . . .
maxcallbitrate
outboundproxy
rtpkeepalive  0 
useragent
callbackextension
...
...
...

In the A2Billing GUI go into System settings>Global and search forrealtime. Change that setting to yes if no. If already yesand having problems try change it to no and save and then change back to yes and save.