special tariff number / special tariff line

Io l'ho incontrato a volte, ma può darsi che ci sia qualche altra maniera x esprimerlo!

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Note added at 14 min (2008-05-28 16:05:37 GMT)
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http://www.premiumline.it/PremiumLine.asp?Lang=eng

Un "aiutino" possibile?

A toll number in a number that costs more to call than a regular local number. You can add "special in the beginning, but it's not necessary.

Premium-rate telephone numbers are telephone numbers for telephone calls during which certain services are provided, and for which prices higher than normal are charged. Unlike a normal call, part of the call charge is paid to the service provider, thus enabling businesses to be funded via the calls. While the billing is different, calls are usually routed the same way they are for a toll-free telephone number, being anywhere despite the area code used. These telephone numbers are usually allocated from a national telephone numbering plan in such a way that they are easily distinguished from other numbers. Telephone companies typically offer blocking services to allow telephone customers to prevent access to these number ranges from their telephones. In some states, telephone companies are required by state law to offer such blocking.