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SWu is an Internet Key Exchange version 2 (IKEv2)-based interface, used to perform authentication, session creation, and negotiate IP Security (IPSec) sessions used at the user plane level. IKEv2 is the protocol used to set up  security associations (SA) in the IPSec protocol suite, and it is specified in RFC 7296.

dsTest supports VoWiFi/VoWLAN testing with the SWu interface. IPSec tunnels are established from the User Equipment (UE) and the evolved Packet Data Gateway (ePDG), allowing access to the Evolved Packet Core (EPC) from non-3GPP untrusted networks. The UE establishes separate SWu instances for each PDN connection, and transports the packets of all bearers for the same PDN Connection between the UE and the ePDG.

The functionality of SWu includes UE-initiated tunnel establishment, user data packet transmission within the IPSec tunnel, and tearing down of the tunnel.

Encapsulating Security Payload (ESP)

ESP is a protocol within the IPSec protocol suite which provides authentication, integrity and confidentially of IP packets. In a tunnel mode the entire packet is encapsulated and encrypted by ESP within another packet as a payload.

Extensible Authorization Protocol (EAP)

EAP  is an authentication framework providing the transport and usage of keying material and parameters generated by EAP methods. For the SWu Interface, EAP-AKA or EAP-TLS is used. dsTest also supports Protected EAP/Tunneled TLS (PEAP/TTLS) over the SWm Interface.


dsTest’s SWu Interface application can be used in conjunctions with other dsTest applications, including SWx, SWm, STa, and SWa to provide a comprehensive VoWiFi/VoWLAN test solution.

As with all dsTest products, the node configurations and test scenarios are easily defined and configured with XML files that are validated against a published XML Schema to avoid invalid definitions. With our dsClient GUI, you can create, run, and archive tests, capture, graph and archive operational measurements, capture real-time data flows, and manage your dsTest servers and testing scenarios with a standalone application that runs on your PC.

Advanced Testing Features

SmartEvents — Alter application behavior or coordinate multiple interface applications with SmartEvents. Our programmable, subscriber-level state machine gives you the ability to define handlers for specified application events that can then cause an event in another application to be executed. You can also configure handlers to modify subscriber information during run-time, introduce timers, or randomize subscriber behavior based on configurable probabilities to name a few of the many options in one of dsTest’s most powerful features.

SmartMessageElement — Insert, delete, or replace elements in Diameter, RADIUS, MAP, LDAP, GTP, REST, or SOAP messages with our SmartMessageElement solution. Define proprietary signaling or corrupt elements to facilitate negative testing. You can specify when your elements are used with SmartEvents.

Traffic Profile — Draw the shape of your test actions across time with Traffic Profile. You can define the rate for any action as a static rate or reference a Traffic Profile configuration, which also means that multiple Traffic Profiles can be running currently. Use Traffic Profile in conjunction with the randomizing features in SmartEvents to design a test that more truly simulates real-world network activity.

Operational Measurements

dsTest provides rich sets of measurements for the SWu interface:

  • 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 IPSec measurements and IP measurements.

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

Supporting Standards