A similar system was written for a telco that I used to work at. It was done in Java, had a team of three and took a few months to write. The reporting web front end was done using a proprietary tool (not Crystal but something similar). That took another developer a couple of months - he spent most of the time fighting the tool (graphs looked fine in development preview mode, bad when deployed to the production server).

They were all good developers, but looking back it seemed to me that it could be done alot more simply in Perl (which I didn't know at the time). I often think that I wouldn't mind rewriting the system myself now that I've learnt a bit of Perl...