. NEST IP-MPLS. . NEST 2.5/3G. . NEST TELEPHONY . . NEST TSM .

NEST Telephony

NEST Telephony is an integrated workbench for the simulation and planing of very large scale PSTN Networks

As any service network, a voice network has finite resources (circuits); it is thus possible that an incoming call cannot be served at a given time: the call is then blocked and cleared. Call blocking is certainly the most noticeable phenomenon in circuit-switched networks. Traffic modeling aims at computing the best estimate of
network resources blocking and carried traffics.

Within the LAAS laboratory, the founders of QoS Design have worked for more than twenty years on conceiving new superior mathematical models (differential modelling) for large telephone networks. The models are described by a set of ordinary differential equations whose structure (and number of equations) depends on the call forwarding rules. These models allow:

• loadsharing on primary routes,
• multiple overflows,
• loadsharing on overflow routes,
• cross-overflows,
• single and bi-directional trunks,
• crankback and 'ARNE flag'-based routings.

Based on this unique modelling approach, NEST Telephony is the QoS Design's solution for the performance analysis and optimization of circuit-switched networks. It allows to compute the Grade of Service of a voice network with a high accuracy and in very short times compared to other approaches. This quick turnaround of results for network behaviour allows planners to efficiently monitor the network and project forward on a timely basis ensuring service levels remain high while saving costs.

NEST Telephony has been designed to meet the essential telephone operators needs. It provides:

• Node-to-node traffic matrix import,
• Traffic routing,
• Traffic overflows handling,
• Capacity planning,
• Grade of Service computation,
  
• Equipment configuration,
  
• Cost computation

Moreover, NEST Telephony has been designed to be tightly coupled with NEST IP-MPLS in order to allow the accurate modelling of the switch-over of voice calls to an end-to-end IP based network. Using both tools, the planner can thus forecast the consequences and the potential benefits of the large scale migration of voice and other PSTN based services to a single converged multi-service IP based network.

In cooperation with our partner SDS (http://software-data-solutions.com), the circuit-switched networks models of QoS Design have been integrated in the NEtwork MOdelling System (NEMOS) of BT Wholesale. NEMOS MT is a planning platform that automatically captures data from the 'real' BT Voice (PSTN) network, generates and simulates network models. It allows an accurate analysis of the Grade of Service of the BT PSTN network and "What-if" analysis to be performed against this network. This means that the impact of projected network and traffic changes can be determined. This system allows planners to manage the complete BT network: a huge system with millions of traffic flows, over 1 million routes, more than 10000 trunks and more than 1000 switching nodes