This section display the actual voice matrix used by loudspeakers (handset speakers, internal loudspeakers). This matrix is the lowest level representation on the application. A lower level can be found in DSPConfig files. On the X axis, you’ll find the list of related devices and in the Y axis a list of rtp inputstream index. A non blank value means a non-muted entry. Notice that the input stream index will be related to the listnHdl value of call table dump. That way a link between a call and a RTP port can be found and be useful when a wireshark trace is taken without sip related packets. This matrix may also be used to check ducking efficiency. If the listnHdl of a call point to an input stream where blank value is found on every device, it means that that call is actually muted locally and the traders is not able to listen to that call.
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