a method and arrangement in a communications network . the object is to provide a way of handing recourse management issues and admission control within an ip telephony system . the object is achieved by a topology aware resource manager collecting routing information concerning the ip network , obtaining resource information concerning resources within the ip network , creating a resource map by combing the routing information and resource information , and performing recourse management issues and admission control within the system by the resource map and by interacting with a gatekeeper .