Forschungs- & Entwicklungsinformationsdienst der Gemeinschaft - CORDIS

End-system based admission control integration in a SIP VoIP client (Euro6IX bandwidth on demand architecture)

The Euro6IX bandwidth on demand architecture follows the state of the art Internet design. Complexity is moved to systems in the network periphery, while the network core mainly forwards packets. Operational systems and standards are used and adapted with minimum changes. Backwards compatibility is maintained to the largest extent. The fundamental Quality of Service mechanism used by Euro6IX is DiffServ. A SIP-based Voice over IP application was chosen to apply the bandwidth on demand feature. The Session Initiation Protocol (SIP) was selected to signal for the telephony service.

The architecture can be extended to any other application supported by SIP. Routers usually don't support SIP signalling, hence a protocol signalling QoS was chosen for this purpose. Euro6IX decided on the Next Steps In Signalling (NSIS) protocol suite, which was "work in progress" during the Euro6IX project execution. Euro6IX choose the Extensible Authentication Protocol as a means for flexible adaptation to RADIUS and DIAMETER AAA infrastructures.

The resulting on demand Quality of service architecture can be implemented stepwise, beginning with a simple scenario with trusted users and ending with a commercial service like environment. Euro6IX specified all components and started implementation and testing. For that reason a SIP-based VoIP application was adapted to use NSIS signalling in order to communicate with the on-link router about the needed network resources for a SIP call.

During the call-setup phase the SIP application signals to the communication peer that it is able to support End-systems based admission control and in the case that the on-link router acknowledges the resource request (via NSIS) from the SIP client for the link both communication peers send test traffic between each other in order to check the availability of resources as well in the backbone network part (End-system based admission control). Only in the case that this test traffic is received without any loss, the SIP call-setup is finished successfully - otherwise a busy signal is assumed. TSN implemented this NSIS functionality and the end system based admission control into a SIP VoIP client and provided this demonstrator within the Euro6IX.

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T-SYSTEMS NOVA GMBH
AM PROBSTHOF 10
53121 BONN
Germany
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