Other products in this market - Developing Solutions (here) and Mobile Metrics (here).
Mr. Karthik Ramalingam, Manager of Product Development, said, “The Diameter protocol is intended to provide a framework for Authentication, Authorization and Accounting (AAA) .. GL’s general-purpose platform for emulation of protocols is Message Automation & Protocol Simulation (MAPS™). Recently Diameter protocol for has been added to its wide range of emulation support. The MAPS™ Diameter gives the users the unlimited ability to edit S6a, S6d, Cx, Dx, Gx, and Rx interface messages to support various procedures such as Location Management, Subscriber Data Handling, Authentication, Fault Recovery, and Notification procedures over S6a interface and AA-Request/Answer, Re-Auth-Request/Answer, Abort-Session-Request/Answer, and Session-Termination-Request/Answer procedure over Rx interface”.
See "GL Announces Diameter Protocol Emulator for LTE" - here.