Telephony covers some topics associated with international telephone calls:
Collect Calls: Connections and Pricing.
Call Connections (opens in new window or tab) is a presentation showing the methods used to connect International Collect Calls, and the paths taken by the associated billing records.
Pricing describes the principles determining the cost of International Collect Calls, and describes in detail the connection methods.
Dialling codes
The Country Code Decoder pages show the international dialling codes (excluding the international dialling prefix, if any) for all countries with a telephone service.
Search facilities allow dialling codes to be found from country names, and vice-versa. Codes for United States and Canada are taken to the state or province level.
The database also provides the time difference relative to GMT for each country.
How reverse-charge calls are billed
IBS Projects demonstrate some aspects of IBS working. To preserve commercial security, some pages have been restricted.