I came across this article on “International Revenue Share Fraud” by ANA Cyber Forensic Pvt. Ltd. It highlights the recommendations for protecting the internal telecom exchange servers. I think we should read this article because it provides insights into protecting our organisation from fraud and scam. The link to this article is provided here: http://anacyber.com/index.php/international-revenue-share-fraud/
I hope you’ll find it use full.