postgresql freeradius for voip

[Ciprian ARSENIE]

Hello 

I want to thank you in advance to those I will answer this question. 

I have configured a RADIUS server with postgresql to store cdr of a cisco
3845 . So far everything has been pretty simple. my question is how do I
calculate the length of the call betwen h323disconnecttime h323connecttime.
can someone  help me with some postgresql Selects to retrive duration o
calls /day/week/mount

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