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dsTest, Developing Solutions, MAP E Interface, VLR/MSC, GMSC, SMS-SC

dsTest supports Message Service Center (MSC)/Visitor Location Register (VLR) client simulation and GMSC/SMS-SC server emulation capabilities for the Mobile Application Part (MAP) E interface. Test SMS-Gateway MSC (GMSC) E interfaces in UMTS networks with our VLR Emulator node. Use the E Interface application to emulate an SMS-GMSC generating MT short messages towards an MSC/VLR. For more information regarding how to use dsTest for MAP functional and compliance testing, see our page on Conformance Testing.


The E Interface application implements the MAP-MT-FORWARD-SHORT-MESSAGE and MAP-MO-FORWARD-SHORT-MESSAGE services. dsTest supports application context versions 1, 2, and 3 for these services.

A complete set of events that can be generated with the E interface can be found here. Use our MAP Dictionary to assist in setting up and interpreting MAP test scenarios.

MSC/VLR Testing (Server Emulation)

Our E Interface application can be used to simulate an SMS-GMSC’s E interface to determine the SMS processing capacity and performance of client MSC/VLR nodes. The E Interface application allows users to validate MSC/VLR performance and capacity in a realistic network environment, replicating the deployment configuration. Execute timed chains of test events to forward messages to subscribers that may or may not be reachable, simulating real-world subscriber activity.

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

GMSC Testing (Client Simulation)

The VLR Emulator node accepts MT short messages for known subscribers and responds with the appropriate error if the subscriber is not known or if any errors in the message would prevent delivery to a subscriber in a real network.

Read more about our VLR Emulator.
Read more about SMS configurations.

Operational Measurements

dsTest provides rich sets of measurements that include but are not limited to:

  • Transaction and transport layer attempts, successes, and failures
  • Transaction duration, transactions-per-second, and round-trip delay
  • Message and byte counters
  • Errors encountered and error indications received in messages

See our Online Help for SMS measurements, MAP measurements, TCAP measurements, SCCP measurements, M3UA measurements, and SCTP measurements.

You can read more about the reporting features offered with dsTest and dsClient here.

Supporting Standards