Hello,
the AVPOPS tutorial has been updated to the latest development version:
http://www.voice-system.ro/docs/avpops/
Among presentations of the new methods (avp_op(), avp_subst(), avp_printf() ...), it includes a new example of how the newest AVPOPS capabilities allow to store and use bitmap ACL per user.
The old version, valid for 0.9.x, is now located at: http://www.voice-system.ro/docs/avpops/0.9.0/
Daniel