System information

304 Real-Time Expert
The RTP timestamp units are based on the sampling rate for a particular payload type. In
the case where there are multiple sources in a single RTCP packet, only the maximum
reported Lost Packet % and Jitter values will be plotted at the given time point.
The last display shows the current conversation’s bandwidth utilization, the total
RTP/RTCP utilization in the capture, and the total network load during the capture.
To view total network utilization, you must have “Include Expert Load Information
packets” checked in Packet Capture setup.
Decoding of VoIP Voice messages—Observer is also able to decode and either save or
play VoIP voice messages.
Select UDP Events from the Expert Data button bar, and right-click on a connection that
contains VoIP voice data.
VoIP data is always contained in RTP conversations, rather than RTCP
conversations. In the example, the protocol used is RTP/G723, a common
format for VoIP voice traffic.
Select either Save Audio... or Play Audio from the popup dialog. Selecting Save Audio
will cause the following dialog to be displayed, permitting the user to enter a name in
which to save the .WAV file.
Selecting Play Audio will cause Windows to play the audio file with whichever program
Windows has been configured to use for .WAV files (usually Windows Media Player).