#I managed to resolved the problem for installing callback-daemon on centos, version 1.7.1 of a2billing. (this should work for other back dated version)

#I am assuming you've retrieved the trunk package using svn and stored all the files under /usr/local/src/a2billing/ #Also your a2billing.conf file is stored here –> /etc/a2billing.conf else take note of the additional steps marked in red

#goto target directory (1) cd /usr/local/src/a2billing/CallBack/callback-daemon-py/dist/

#untar the r1528 file to create callback_daemon-1.0.prod-r1528 directory (2) tar -xvf callback_daemon-1.0.prod-r1528.tar.gz

#Go down into the newly untared directory (3) cd callback_daemon-1.0.prod-r1528

#excute the following python commands as per a2billing doc site (4) python setup.py build (5) python setup.py bdist_egg #additional steps to correct the path for the a2billing.conf file (5b) vi callback_daemon/a2b_callback_daemon.py (5c) replace the path to which your a2billing.conf resides in your system, the line should be –> CONFIG_FILE = #execute the installation (6) easy_install dist/callback_daemon-1.0.prod_r1528-py2.4.egg

#install the init script and daemon service (still at your current directory level) (7) cp build/lib/callback_daemon/a2b-callback-daemon.rc /etc/init.d/a2b-callback-daemon (8) chmod +x /etc/init.d/a2b-callback-daemon (9) chkconfig –add a2b-callback-daemon (10) chkconfig a2b-callback-daemon on

# finally start the service u can either use the init script or service command (11a) service a2b-callback-daemon start (11b) /etc/init.d/a2b-callback-daemon start