SetCDRUserField() — Sets the Call Detail Record user field
Sets the CDR user field to the specified
value. The CDR user field is an extra field
that you can use for data not stored anywhere else in the record. CDR
records can be used for billing purposes or for storing other
arbitrary data about a particular call.
exten => 123,1,SetCDRUserField(testing) exten => 123,2,Playback(tt-monkeys)