[Freeswitch-users] Monitoring via SNMP

Dear All, I couldn't find much information about how to monitor Freeswitch via SNMP like how many calls/legs I have, how many CAPs, and etc. One of the thing I do currently is to make simple bash script which in general runs "fs_cli -x 'show calls count'" or some other command and call that script via snmpd.conf. I would appreciate if somebody tell me if they is snmp module in Freeswitch, or provide with link/method from where I can read some information. Thanks!