In Figure 1, an LU-LU session between HOSTA and HOSTC can use an RTP connection that traverses the APPN host-to-host channel connections between HOSTA and HOSTB and between HOSTB and HOSTC. For sessions between HOSTA and HOSTC, HOSTB provides only ANR-level support. However, for sessions between HOSTB and HOSTC, HOSTB can provide RTP-level support as the endpoint of an HPR route. Similarly, though not pictured, HOSTB can provide RTP-level support for sessions between HOSTB and HOSTA.