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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.
Some are mechanical and some are chemical. There is naturally some overlap with printing processes and photographic processes, but the challenge of precisely duplicating business letters, forms, contracts, and other paperwork prompted some unique solutions as well. There were many short-lived inventions along the way.
A call detail record contains data fields that describe a specific instance of a telecommunication transaction, but does not include the content of that transaction. By way of simplistic example, a call detail record describing a particular phone call might include the phone numbers of both the calling and receiving parties, the start time, and duration of that call.
Please, take note of other templates that may be applicable for other uses (i.e. in-line inclusion): {{Cite patent}}, creates links to US and other patents on the espacenet database {{Citeref patent}}, for an inline citations to a patent bibliography
The correct format for a Mayday call is as follows: [The first part of the signal is known as the "call"] Mayday, Mayday, Mayday, This is (vessel name repeated three times, followed by call sign if available) [The subsequent part of the signal is known as the "message"] Mayday (vessel name)
It is still common for a business letter to include, at the end, a list of names preceded by the abbreviation "CC", indicating that the named persons are to receive copies of the letter, even though carbon paper is no longer used to make the copies. An alternative etymology is that "c:" was used for copy and "cc:" indicates the plural, just as "p."
A plain-language radio check is the means of requesting and giving a signal strength and readability report for radiotelephony (voice) communications, and is the direct equivalent to the QSA and QRK code used to give the same report in radiotelegraph communications.
The number is presented starting with the telephone country code. This is called the globalized format of an E.164 number, and is defined in the Internet Engineering Task Force RFC 2806. [6] The international calling prefix is a trunk code to reach an international circuit in the country of call origination. [7]