Abstract: A system and method to test voice quality over a call path on a packet based network. A call signaling path is established between a first voice quality tester (VQT) and a second VQT. The call signaling path includes one among multiple call signaling stacks, each operating according to a particular call signaling protocol. By using a graphical user interface (GUI), a user can select the call signaling stack to be used, and change between call signaling stacks in real time.

Abstract: Methods and devices for evaluating audio quality in a network are described. First and second audio samples are compared. The first audio sample includes a reference signal that is transmitted through a path on the network. The second audio sample includes the reference signal after it has traveled the path and is received. In addition, network performance while the reference signal travels the path is monitored. The results of the comparison are correlated with network performance statistics derived from the monitoring.

Abstract: A system and method for voice quality testing (VQT) in a packet switched voice communications network. A test system comprises a set of pre-encoded test data. The test data is pre-encoded using a set of audio codecs that can be used for voice communication on the network. During VQT, data can be selected from the set of pre-encoded data for transmission over the network, thereby eliminating the real-time overhead involved in voice coding of the test audio waveforms. The pre-encoding can also be extended to include processing associated with one or more data transmission protocols, thus further reducing the computational requirements for testing. To reduce the size of the set of test data, codecs on the network can be identified and test data pre-encoded using only the identified codecs prior to VQT.

Abstract: A system and method to test voice quality over a call path on a packet based network. A call signaling path is established between a first voice quality tester (VQT) and a second VQT. The call signaling path includes one among multiple call signaling stacks, each operating according to a particular call signaling protocol. By using a graphical user interface (GUI), a user can select the call signaling stack to be used, and change between call signaling stacks in real time.

Abstract: Disclosed is a communications measurement matrix display for a protocol analyzer which is used to monitor traffic on a packet-switched network. The display allows the protocol analyser user to see, at a glance, a complete and accurate overview of communications between more than thirty-one nodes on a packet-switched network, over a user selectable range of measurement-time intervals. The matrix display has two modes. One mode shows the source versus the destination nodes of the network as a 32-.times.-32 two-dimensional X-Y grid matrix having thirty one source nodes ordinally indicated along one grid axis and thirty one destination nodes ordinally indicated along the other grid axis. The thirty second ordinal position on each axis designates any nodes other than the first thirty one nodes. A display marker postioned on the grid indicates communication between the source node and the destination node which correspond to the (X,Y), that is, the (SOURCE, DESTINATION), coordinates of the marker.