provided by Star2Billing S.L.

Dear friends,
I have following lines when started call-back daemon after first installation.
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[root@pabx:~]$ service a2billing-callback-daemon start
a2b_callback_daemon is stopped
Traceback (most recent call last):
File "/usr/bin/a2b_callback_daemon", line 7, in ?
sys.exit(
File "/usr/lib/python2.4/site-packages/setuptools-0.6c5-py2.4.egg/pkg_resources.py", line 236, in load_entry_point
return get_distribution(dist).load_entry_point(group, name)
File "/usr/lib/python2.4/site-packages/setuptools-0.6c5-py2.4.egg/pkg_resources.py", line 2097, in load_entry_point
return ep.load()
File "/usr/lib/python2.4/site-packages/setuptools-0.6c5-py2.4.egg/pkg_resources.py", line 1830, in load
entry = __import__(self.module_name, globals(),globals(), ['__name__'])
File "/usr/lib/python2.4/site-packages/callback_daemon-1.0.prod_r1527-py2.5.egg/callback_daemon/a2b_callback_daemon.py", line 23, in ?
File "/usr/lib/python2.4/site-packages/callback_daemon-1.0.prod_r1527-py2.5.egg/callback_daemon/database.py", line 28, in ?
ImportError: cannot import name sessionmaker
Starting a2b-callback-daemon: [FAILED]
[root@pabx:~]$
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Please help me to find a problem, I spend a week with it.

I've never worked on Python code, but to my eyes this is the root of your problem. It seems Python is having trouble finding a library called 'sessionmaker'. A quick google shows that 'sessionmaker' is part of 'sqlalchemy.orm'. You should install that. I guess the .egg should too...