When the session endpoints are in separate subarea networks connected by one or more APPN networks, translation of subarea to HPR can occur if the interchange nodes are IBM® Communications Server for OS/390® V2R10 or later. For instance, in Figure 1, if HOSTA and HOSTD are both subarea nodes and there is a session between LUA and LUD through HOSTB and HOSTC, HOSTB and HOSTC will translate subarea data received to HPR and route it across the RTP connection between them. If the interchange nodes are separated by other APPN nodes, the RTP connection from each interchange node is limited to its adjacent node. The RTP connection between intermediate nodes can include multiple nodes.