difference between ${CDR(duration)} and ${CDR(billsec)} in asterisk dialplan

问题

I want to get the duration of the call but confused which variable to use

${CDR(duration)} or

${CDR(billsec)}

Here it is not clear from when ${CDR(duration)} records the time

So which should i use ${CDR(duration)} or ${CDR(billsec)} ?

回答1:

Call come in, after that not answer X second, after that answered, after that Y sec speak/play something and hangup.

So duration will be X+Y, while billsec(time to be billed) will be Y.

回答2:

BillSec is "how long was the call off hook" ... a common metric for things like LD billing or "usage minutes".

Duration is "how long from start to finish, including switching delays and redirections" ... note that technically Duration can be >0 while BillSec == 0, if the call was routed but not answered.

Since you don't say what you need to know the value for, it's hard to tell you which version you need.

来源：https://stackoverflow.com/questions/24860456/difference-between-cdrduration-and-cdrbillsec-in-asterisk-dialplan