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FAQ-What Are the Syntax Rules of the H.248 Digitmap

Publication Date:  2012-07-25 Views:  53 Downloads:  0
Issue Description
Q:
What are the syntax rules of the H.248 digitmap?
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Handling Process
A:
The digitmap syntax formats in the RFC3435 appendix are explained as follows:
Digitmap: Consists of a digitmap string or a list of digitmap strings.
List of digitmap strings: Consists of zero or multiple digitmap strings separated by the symbol "|".
Digitmap string: Consists of one or more digitmap string elements.
Digitmap string element: Consists of a digit position or a digit position + ".".
Digit position: Consists of a digitmap character or a digitmap range.
Digitmap character: Refers to the numerals 0 to 9, "*", "#", "A", "B", "C", "D", "T" or "X" and other extended digitmap characters. 
Extended digitmap characters: "E"/"F"/"G"/"H"/"I"/"J"/"K"/"L"/"M"/"N"/"O"/"P"/"Q"/"R"/"S"/"U"/"V"/"W"/"Y"/"Z"
Digitmap range: "X" or "[" + "Digital character" + "]"
Digital character: Consists of two types of characters. One is composed of a numeral + - (a hyphen) + a numeral such as 0-9. The other is a digitmap character. These two types of strings can appear repeatedly.
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