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The most common in the world is Recommendation E.123 E.123 International Telecommunication Union [11] and the standard format for Microsoft telephone numbers Microsoft. [ 12 ] There is an international format for recording a telephone number containing the country code, settlement code and telephone number, and the national format containing ...
Microsoft canonical address format for telephone numbers [2] [3] derives from E.123 international notation by allowing explicit indication of area code with parentheses. The canonical format is used by the Telephony API (TAPI), a Windows programming interface for dial-up fax, modem, and telephone equipment.
In the international telephone network, the format of telephone numbers is standardized by ITU-T recommendation E.164. This code specifies that the entire number should be 15 digits or shorter, and begin with an international calling prefix and a country prefix.
TAPI uses Microsoft canonical address format for telephone numbers [1] [2] to make phone calls. It is a derivative of E.123 international notation. The canonical address is a text string with the following format: +Country␣(AreaCode)␣ SubscriberNumber | Subaddress ^ Name CRLF.
Some small VOIP operators also cannot call toll free numbers. For example, 0701-xxx-xxx cannot call toll free numbers directly, but can call through a live operator by dialling "123" and have them redirect the call. In Thailand, for the Call Free, Free Call, Toll-Free, or Free Phone service, the format used is "1800-xxxxxx". Calls are free for ...
Although toll-free numbers are not accessible internationally, many phone services actually call through the U.S., and in this case the toll-free numbers become available. Examples of these services are the erstwhile MCI Worldphone international calling card and any U.S.-based Internet telephone gateway. However, many calling card services ...