The DRMA protocol is an Oracle proprietary Diameter based protocol that allows multiple MRA clusters in the network to communicate and share Diameter Routing Agent (DRA) binding information. DRMA ensures that all the Diameter sessions for a subscriber are served by the same MPE device. As a result, MRA devices can query one another for binding information by sending a DRA-Binding-Request (DBR) command and receiving a DRA-Binding-Answer (DBA) in response.