Allowed characters are 0~9, *, T, S, P, x, ., | and range format characters that include '~', ',' and parenthesis '(', ')', brackets '[', ']', braces '{', '}' and at most one parenthesis pair are allowed, Examplesh '002(*)', '0(*)', and '(*)'. '*' represents one or more digit characters 'x' represents any digit character 'T' timeout send of dial string, can only appear at the end of pattern 'S' star phone key (*) match character in dial plan 'P' pound key (#) match character in dial plan '.' represents zero or more repetitions of character or range that precedes it, can't use the dot character '.' in brackets '|' used to separate multiple number plan patterns [n~m,k] match a range of digits n~m or a specified digit k, '[' and ']' must pair and nest brackets is illegal '~' and ',' are allowed showing in brackets only '~' connected characters must be digit {n} match n digits