File name convension details


How to find extension names from .wav file name.
I made two calls from my pbx
1)104 to 105 Ext and Call monitor file name is "20141001-115146-1412178706.20.wav"
How to confirm above file belongs to my call 104- 105
2)I made a outbound call from 104 ext and the monitor file name is "OUT104-20141001-120047-1412179247.22.wav ". How do I know the called phone number from the file name.

Please help me to find answers for above 2 questions.