CallPattern callPattern = new CallPattern(prefix, CallDigits.VARIABLE_DIGITS);
CallPattern callPattern = new CallPattern("", CallDigits.VARIABLE_DIGITS);
    public IntercomRule(String prefix, String code) {        m_dialPattern = new DialPattern(prefix, DialPattern.VARIABLE_DIGITS);                m_transform = new FullTransform();        CallPattern callPattern = new CallPattern(prefix, CallDigits.VARIABLE_DIGITS);        String user = callPattern.calculatePattern();                m_transform.setUser(user);        String headerParam = String.format("Alert-info=%s", code);        m_transform.setHeaderParams(new String[] {headerParam});    }