public Collection getAvailableGateways(Integer ruleId) {
public Collection<Gateway> getAvailableGateways(Integer ruleId) {
    public Collection getAvailableGateways(Integer ruleId) {        DialingRule rule = m_dialPlanContext.getRule(ruleId);        if (null == rule) {            return Collections.EMPTY_LIST;        }        List allGateways = getGateways();        return rule.getAvailableGateways(allGateways);    }