SetCDRUserField( ) Sets the Call Detail Record user field
SetCDRUserField(value)
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)