Telex Number

telex-number  = actual-number DOLLAR country-code DOLLAR answerback
actual-number = PrintableString
country-code  = PrintableString
answerback    = PrintableString
DOLLAR             = %x24 ; dollar sign ("$")
PrintableString    = 1*PrintableCharacter
PrintableCharacter = ALPHA / DIGIT / SQUOTE / LPAREN / RPAREN /
PLUS / COMMA / HYPHEN / DOT / EQUALS /
SLASH / COLON / QUESTION / SPACE
ALPHA              = %x41-5A / %x61-7A   ; "A"-"Z" / "a"-"z"
DIGIT              = %x30 / LDIGIT       ; "0"-"9"
LDIGIT             = %x31-39             ; "1"-"9"
SPACE              = %x20 ; space (" ")
SQUOTE             = %x27 ; single quote ("'")
LPAREN             = %x28 ; left paren ("(")
RPAREN             = %x29 ; right paren (")")
PLUS               = %x2B ; plus sign ("+")
COMMA              = %x2C ; comma (",")
HYPHEN             = %x2D ; hyphen ("-")
DOT                = %x2E ; period (".")
EQUALS             = %x3D ; equals sign ("=")
SLASH              = %x2F ; forward slash ("/")
COLON              = %x3A ; colon (":")
QUESTION           = %x3F ; question mark ("?")
The syntax corresponds to the `TelexNumber` ASN.1 type,
defined in X.520.