The Investigation Of Testing And Evaluation For Telegraphic QoS Based On Softswitch

Softswitch theory is a kind of distributed switching and controlling platform based on software. The calling service is separated from the gateway in this kind of network, so that an environment with multi-suppliers is coming true via opening the protocols between the business, control, insert and exchange, and it is much more convenient to bring new network service. The softswitch technology is the hardcore in the next generation of network.Softswitch network derived from the IP network, so the voice service is one of the most basic businesses in the softswitch net. Since the present softswitch is still in pilot-run, it is necessary to research in the QoS of the softswitch in order to raise the quality of the voice service in the softswitch network. It is really necessary to research on the performance of the IP net witch is not only the carrier network of the softswich net, but also affect the services in the softswitch net.This paper tests and evaluates the carrier network of Suzhou Telecom via researching the softswitch network, business mode, buildup of the carrier network and performance. A testing method is provided. In this method, 6 testing stations are set up in the testing carrier network of Suzhou Telecom, in order to calculate the real P2P data quantity in the application layer. In this paper, we used testing software named IxChariot, which is provided by IXIA. The carrier network is evaluated by testing MOS, one-waydelay, jitter and lost data. In this test, we find the performance of the voice service in the NGN carrier network is good. However some problems are found, such as the consecutive lost-datagrams would last about 10 second some time in some channel, and 0.3% of the quality of the voice service is down. So we can find there are some problems on the QoS in the IP net, witch is also the carrier network of softswitch network. Some advice is offered to improve the network based on this testing method and the final purpose is to push the QoS of the softswitch via optimizing the performance of the carrier network.