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999 (emergency telephone number) A sign on a beach in Whitstable, United Kingdom, advising readers to dial 999 and to request for the coastguard in the event of an emergency. 999 is an official emergency telephone number in a number of countries which allows the caller to contact emergency services for emergency assistance.
A reverse telephone directory (also known as a gray pages directory, criss-cross directory or reverse phone lookup) is a collection of telephone numbers and associated customer details. However, unlike a standard telephone directory, where the user uses customer's details (such as name and address) in order to retrieve the telephone number of ...
VoIP phone. A VoIP phone or IP phone uses voice over IP technologies for placing and transmitting telephone calls over an IP network, such as the Internet. [1] This is in contrast to a standard phone which uses the traditional public switched telephone network (PSTN). Digital IP-based telephone service uses control protocols such as the Session ...
A telephone number serves as an address for switching telephone calls using a system of destination code routing. [1] Telephone numbers are entered or dialed by a calling party on the originating telephone set, which transmits the sequence of digits in the process of signaling to a telephone exchange.
Telephone numbers in the Republic of China (Taiwan) use a system of area codes, beginning 02 to 08. The leading digit (s) following the area code denote the network operator ( Chunghwa Telecom and its competitors). Mobile numbers begin 09. The international code for calls into Taiwan is 886.
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E.164 is an international standard ( ITU-T Recommendation), titled The international public telecommunication numbering plan, that defines a numbering plan for the worldwide public switched telephone network (PSTN) and some other data networks . E.164 defines a general format for international telephone numbers.
The total length of all phone numbers (area code and the phone number) is constant at 10 digits. For example, the number 7513200000 signifies the area code 751 (the area code for Gwalior) followed by the phone number.