International Shared Cost Service - Series E: Overall Network Operation Telephone Service Service Operation and Human Factors - Operation Numbering Routing and Mobile Services - International Operation - Operation of International Telephone Services Study
The International Shared Cost Service (ISCS) enables an ISCS customer in one country to be assigned one or more special telephone numbers in other countries which allow ISCS callers in those countries to call the ISCS customer at a rate equivalent to a na