Yes, there's a company based in England with a U.S. office that specializes in these adapters. The company is TeleAdapt which provides worldwide connectivity for travelling portable computer users. Ideally you brought your DAA cable (which has a 8-pin minicircular connector on the PowerBook end and the telephone plug on the other end) to use with the adapters available from TeleAdapt. To locate a vendor's address and phone number, use the vendor name as a search string.
Support Information Services