A Quick google search gave me a possible link to CDR ASN1 in Doc format - as being in
32298-880.doc - 3GPP
I Therefore navigated to http://www.3gpp.org/ftp/Specs/archive/32_series/32.298/ and found the file called 32298-880.zip I downloaded this - and it is indeed a CDR charging document.
But is it the ONLY Cdr Charging document ??
I have see a few references to Lame-Editor - an OpenSource ASN1 Editor - which also seems to work with the asn1c compiler.
I pulled the source from SourceForge Source Code
And then moved it into my Ubuntu 14 Environment ]