The fundamental economics of crime remain the same, whether the vehicle is an international email or an international voice call.
Taher Talib of Shaw Communications explained why their Subex FMS automatically shares data about wangiri with other telcos.
Customers of Angolan operator UNITEL were said to have received calls that apparently originated from a wide range of countries.
Fraud managers who seek superior profits by refusing to share intelligence are wrong about crime, economics and customers. That is why they would never dare say publicly what they admit in private.
There has been no fall in the number of times the public is alerted to spikes in wangiri fraud, but the content of the warnings has evolved.
Telcos need to adopt a multi-layered approach to protecting their customers from conmen.
The recent wangiri attack upon Kenyans emphasizes the need for global cooperation to prevent wangiri fraud.
The US Department of Justice is seeking to stop two VoIP carriers that provided a gateway for millions of scam calls.
The TRACED Act demands US telcos authenticate calls over IP and TDM networks, but the provisions for international enforcement and tackling wangiri fraud also raise questions for foreign telcos.
Anti-spam firm Truecaller claims that telcos generated almost half of the 45 spam voice calls that Brazilian phone users receive each month.