asterisk users - Jun 2010 - What's diff between ${CDR(start)} , ${CDR(answer)} , ${CDR(calldate)}

hi,all
   for a long time, i cant understand the difference between
${CDR(calldate)} and ${CDR(start)} , ${CDR(answer)}

i know ${CDR(start)} mean when a call is start. and  ${CDR(answer)}
means when a call was pick up.

but what's  ${CDR(calldate)} mean?


Could you help me ?

Thansk a lot!


-- 
Thanks for your supporting,
have a nice day.
Sucan

On Friday 18 June 2010 03:21:32 Zhang Shukun wrote:
> hi,all
>    for a long time, i cant understand the difference between
> ${CDR(calldate)} and ${CDR(start)} , ${CDR(answer)}
>
> i know ${CDR(start)} mean when a call is start. and  ${CDR(answer)}
> means when a call was pick up.
>
> but what's  ${CDR(calldate)} mean?
It could mean whatever you want.  CDRs (at least the internal representation)
have support for arbitrary additional variables.  Whether a particular backend
has support to carry those over into permanent storage is another question
(in 1.6.2, most CDR backends have it, as long as the underlying table has a
column to receive the data).

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