Recommendation ITU-T H.248.43 contains several packages to support gate management/control at the boundary of IP domains. These packages allow a media gateway to be configured to filter packets based on rules for different criteria such as source address/port, destination address/port and protocol type. These rules are logically combined and admit/discard the packets matching any or all of them according to the behaviour specification. These filtering policies may be applied on an individual termination or the root termination by the media gateway controller or management action.