CallableStatement stmt = connection.prepareCall("{CALL some_proc()}");

"{CALL SOME_PROC(?)}"

        ESCAPE_ENTER_STATE {
            protected FBEscapedParser.ParserState nextState(char inputChar) throws FBSQLParseException {
                switch(inputChar) {
                case '?':
                case 'c':
                case 'd':
                case 'e':
                case 'f':
                case 'l':
                case 'o':
                case 't':
                    return NORMAL_STATE;
                default:
                    throw new FBSQLParseException("Unexpected first character inside JDBC escape: " + inputChar);
                }
            }
        },

    private void escapeToNative(StringBuilder target, String escaped) throws SQLException {
        StringBuilder keyword = new StringBuilder();
        StringBuilder payload = new StringBuilder(Math.max(16, escaped.length()));
        this.processEscaped(escaped, keyword, payload);
        String keywordStr = keyword.toString().toLowerCase();