The revised Annex G in this amendment describes methods to allow address resolution between or within administrative domains in H.323 systems for the purpose of completing calls within or between the administrative domains. Logical elements within an administrative domain that implement the procedures described in this amendment are called peer elements. An administrative domain exposes itself to other administrative domains through a type of peer element known as a border element. In this version, this annex now describes only the procedures to be followed in such communications. The protocol message definitions have been moved to ITU-T Rec. H.501. This version also extends the applicability of the protocol to within administrative domains in addition to between administrative domains. This annex fosters the scalability and interconnection of H.323-based networks by minimizing provisioning burden and providing routing and usage information between networks.