Have you looked at http://www.gedis-studio.com/online-call-detail-records-cdr-generator.html ?

On Sat, Mar 1, 2014 at 7:39 AM, John Lilley <john.lilley@redpoint.net> wrote:

I would like to explore Call Data Record (CDR aka Call Detail Record) analysis, and to that end I’m looking for a large (GB+) CDR file or a program to synthesize a somewhat-realistic sample file.  Does anyone know where to find such a thing?