Currently, all orchestrators are named the same. Although there may not be many orchestrators in an infrastructure, they become indistinguishable once there is more than one. Using the first part of the path of the EPR would be a good option.
E.g. the service orchestrator at https://zam025s01.zam.kfa-juelich.de:7701/ORCHESTRATOR/ServiceOrchestrator
would be names ORCHESTRATOR.