[Serusers] Syslog options

[Marc Khayat]

hi all,
i'm using ser-0.8.14, and i'm receiving call logs on a syslog server.
But i'm not getting the call duration: in the below logs, SER is 
linux.domain.net, 192.168.0.150 is registered, 65.25.48.112 is not 
registered but stateful routing is used (t_relay_to_udp)

Mar 17 17:22:56 linux /sbin/ser[10908]: ACC: transaction answered: 
method=INVITE, i-uri=sip:33 at linux.domain.net, o-uri=sip:33 at linux.domain.net, 
call_id=0318F319-981E-4AD7-86E8-1DA55DB661C3 at 192.168.0.150, from=Marc Khayat 
<sip:777 at linux.domain.net:5061>;tag=3813796527, code=200, 
to=<sip:33 at linux.domain.net>;tag=b5422284a4
Mar 17 17:22:56 linux /sbin/ser[10912]: ACC: request acknowledged: 
method=ACK, i-uri=sip:33 at 65.25.48.112, o-uri=sip:33 at 65.25.48.112, 
call_id=0318F319-981E-4AD7-86E8-1DA55DB661C3 at 192.168.0.150, from=Marc Khayat 
<sip:777 at linux.domain.net:5061>;tag=3813796527, code=200, 
to=<sip:33 at linux.domain.net>;tag=b5422284a4
Mar 17 17:22:58 linux /sbin/ser[10915]: ACC: transaction answered: 
method=BYE, i-uri=sip:33 at 65.25.48.112, o-uri=sip:33 at 65.25.48.112, 
call_id=0318F319-981E-4AD7-86E8-1DA55DB661C3 at 192.168.0.150, from=Marc Khayat 
<sip:777 at linux.domain.net:5061>;tag=3813796527, code=200, 
to=<sip:33 at linux.domain.net>;tag=b5422284a4

I tried the options in log_fmt, but there's nothing.

How is it best to do accounting if syslog will not give me the call 
duration? would there be any difference (call duration, ASR, ...) if I use a 
Radius or MySQL ?

Thanks!