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dsTest, Developing Solutions, T4 Interface, CIoT, NB-IoT, EPC Testing, MTC-IWF, SMS-SC


dsTest supports both server emulation and client interface simulator capabilities for the 3GPP LTE T4 Diameter interface.   Use our T4 Interface application on our Machine Type Communication Interworking Function (MTC-IWF) node simulator to test the capacity and performance of a SMS Service Center (SMS-SC).  Use our GMSC/SMS-SC Emulator with the T4 interface application to test MTC-IWF network nodes.  Customize T4 messages using our SmartAVP feature.  If you are testing CIoT/NB-IoT, dsTest can surround a CIoT Serving Gateway Node (C-SGN) with all the interfaces needed to verify the functions required of the C-SGN.   T4 is stateless, and is specified in 3GPP TS 29.337.

Comprehensive sets of Operational Measurements for the T4 Interface, Diameter, and socket level are collected at user-specified intervals and stored in a SQLite database on the dsTest server.  Real-time measurements may be retrieved through our dsClient CLI interface or graphed via our dsClient GUI interface.


The T4 Inteface Application implements the following 3GPP procedures:

A complete set of events that can be generated with the T4 interface can be found here, and our Diameter Dictionary can be used to design, test, and validate your Diameter testing.

The T4 Diameter application application ID is 16777311, and the vendor identifier is 10415 (3GPP).

MTC-IWF Testing (Server Emulation)

The GMSC/SMS-SC server emulator initiates the appropriate procedure when appropriate, eliminating the need to dedicate a production server to lab activities.  You can manually trigger server-initiated procedures such as Alert Service Center by executing a event chain with a run-time command or during an automated test.

GMSC Testing (Client Simulation)

Our T4 Interface application simulates a MTC-IWF interface to determine the processing capacity and performance of a GMSC.  The T4 interface application allows users to validate GMSC performance and capacity in a realistic network environment, replicating the deployment configuration.  Execute timed chains of test events with a run-time command or during an automated test using our SmartEvents feature to trigger SMS-SC-initiated procedures.

Multiple GMSC/SMS-SC and MTC-IWF nodes can be instantiated on a single dsTest server or VM, each with scalable subscriber loads and transaction rates. In this mode the T4 interfaces of up to 1000 independent MTC-IWF nodes may be simultaneously simulated.  The nodes are fully independent and their subscriber configurations may also be independent, overlap, or be duplicated.

Supporting Standards