CDR Variables.txt

$AGI->get_variable('CDR(start)');

https://wiki.asterisk.org/wiki/display/AST/CDR+Variables

CDR Variables
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Created by Malcolm Davenport, last modified on Aug 31, 2010 Go to start of metadata
If the channel has a CDR, that CDR has its own set of variables which can be accessed just like channel variables. The following builtin variables are available.
${CDR(clid)} Caller ID
${CDR(src)} Source
${CDR(dst)} Destination
${CDR(dcontext)} Destination context
${CDR(channel)} Channel name
${CDR(dstchannel)} Destination channel
${CDR(lastapp)} Last app executed
${CDR(lastdata)} Last app's arguments
${CDR(start)} Time the call started.
${CDR(answer)} Time the call was answered.
${CDR(end)} Time the call ended.
${CDR(duration)} Duration of the call.
${CDR(billsec)} Duration of the call once it was answered.
${CDR(disposition)} ANSWERED, NO ANSWER, BUSY
${CDR(amaflags)} DOCUMENTATION, BILL, IGNORE etc
${CDR(accountcode)} The channel's account code.
${CDR(uniqueid)} The channel's unique id.
${CDR(userfield)} The channels uses specified field.
In addition, you can set your own extra variables by using Set(CDR(name)=value). These variables can be output into a text-format CDR by using the cdr_custom CDR driver; see the cdr_custom.conf.sample file in the configs directory for an example of how to do this.