[Freeswitch-users] call duration for bash script

[thomas peterseil]

hello freeswitch-users,
i would like to run a bash script after a call and for this script i
need the duration of that call. i found the variable "billsec", but i
couldn´t find any dialplan examples how to use this variable. can
someone give me a hint how i can hand over the duration of the call to
a bash script in the dialplan.
thank you very much!
best regards,
thomas