I am using FreePBX with Asterisk (1.8.15-cert1) and I am making calls through Adhearsion application. Now the scenario is that recording files are generated for every call, but only some contain actual recording others are empty having size 44 bytes.
I observed that calls made to regular phones are getting recorded while calls which are answered by an automated machine i.e. answering machine are not recorded (empty recording file is saved).