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CAMEL Phase 1 defined only very basic call control services, but introduced the concept of a CAMEL Basic call state model (BCSM) to the Intelligent Network (IN). Phase 1 gave the gsmSCF the ability to bar calls (release the call prior to connection), allow a call to continue unchanged, or to modify a limited number of call parameters before allowing it to continue.
In the business context, the numbers in the format of 15XX-XXXX and 16XX-XXXX are business representative agency or customer services. While the numbers starting with 080 (e.g., 080-XXX-XXXX) are also business-related numbers but are usually toll-free customer service centers. Also in this case, 15XX, 16XX or 070 are not put in the brackets ...
Modern smart phones have added a built-in layer of abstraction whereby individuals or businesses are saved into a contacts application (akin to an electronic address book) and the numbers no longer have to be written down or memorized. A telephone number serves as an address for switching telephone calls using a system of destination code ...
It is the practice of including the area code of a telephone number when dialing to initiate a telephone call. When necessary, the ten-digit number may be prefixed with the trunk code 1 , which is referred to as 1+10-digit dialing or national format .
In telephony, call progress tones are audible tones that provide an indication of the status of a telephone call to the user. The tones are generated by a central office or a private branch exchange (PBX) to the calling party .
The official toll-free hotline for the California Department of Transportation's Adopt-a-Highway program is 1-866-236-7824, but signs advertise the number as 1-866-ADOPTAHWY, with two extra digits, for memorability. The letters have also been used, mainly in the United States, as a technique for remembering telephone numbers easily.
The North American Numbering Plan is based on a ten-digit telephone number assigned to each telephone in the telephone network. The number is composed of the three-digit numbering plan area code, a three-digit central office code, and a four-digit station or line number. Certain rules govern the numerical format of each part.
Another sound-based application is call whispering, which is a message played to an agent after answering a call that can give them information about the call in advance based on the Caller ID, number dialed or route taken through the system. [6] Call management can also include directory programming for received calls.