7.1 QoS Overview

The public switched telephone network (PSTN) defines quality of service as a particular level of service, for example "toll-like" service. However, quality of service for voice or other media over the Internet Protocol is defined as a continuum of levels, which are affected by packet delay or loss, line congestion, and hardware quality such as microphone quality. The IP media software is designed to operate along the entire range of quality of service, enabling the application to retrieve information necessary for correct billing.

All QoS parameters supported by the IP media software are disabled by default. That is, QoS monitoring must be enabled by the application. If desired, the application can set threshold values to monitor the quality of service during sessions. The QoS parameters are measured during time intervals, starting when a session is established. A fault occurs when the measurement of a QoS parameter crosses a predefined threshold. A success occurs when the measurement of a QoS parameter does not exceed a predefined threshold value.

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