If you and your computer have ever had the misfortune of being attacked by a Trojan Dialer specific to 900 numbers, you more than likely have been dealing with the likes of EBSI (Enhanced Billing Services Inc) & Integretel (Both are Billing Aggregators) from entries on your phone bill. They are representing the internet scam outfits such as MMI Communications , Information Services and Live Interactive to name a few.
Unauthorized and evasive charges have been placed there by these organizations via the malicious dialer which accesses international 900 number sites.