1/31/2024 0 Comments Wireshark for ios download![]() ![]() Note the filtered packet count at the bottom pane on the Wireshark utility on both captures. When you apply the filter, you see this at the central site and the branch site: Observe the packets that captured at both points between the same sequence numbers (RTP sequence number range). If you see that one of the captures does not include a few packets at the start/end, use the first sequence number or the last sequence number in the capture missed in both packets to refine the filter for both the captures. When captures are simultaneously taken, no packets are missed at the start or end on both captures. These packets are present in both the captures and refine the filter to display only those packets between the start and the end RTP sequence numbers. Select a start and end sequence number.Note: It is possible that the branch site might start some sequence numbers after 45514. The sequence numbers are used to refine the stream in case the captures were not taken simultaneously, but with slight delay between them. Refine the filter to match only the packets between the first and the last RTP streams.Make sure that the first and the last RTP sequence number packets are present in both captures.for example, central and branch captures) and note that the SSRC for the the stream would be the same on both the captures.The first RTP sequence number is 45514 an the last is 50449 for the filtered out video RTP stream. Note: Write down the first and the last RTP sequence numbers for this stream. You will only see the video RTP stream shown in this screenshot. ![]() In the previous screenshot, one of the packets from the video stream is selected and you can see the Src Port (20568) and the Dst port (20808) information on the bottom pane. View the port number by selecting one of the packets which displays the UDP port information on the bottom pane in the Wireshark utility.Focus on the video RTP stream and use the UDP port numbers for this stream to filter out other streams. The problem is now only with video quality. Note: The Audio stream is in G.722 codec format and the Dynamic-RTP-97 payload type indicates the video RTP stream. This decodes both the audio and the video streams into RTP. Select a packet from the undecoded stream and decode it as RTP.You are left with one stream decoded as RTP and the other as undecoded UDP. ![]() Click Accept and Ok in order to decode the stream as RTP.Select a packet from one of the streams and right-click the packet.Stream 2 : UDP source port : 20561, destination port : 20801.Stream 1 : UDP source port : 20560, destination port : 20800. ![]() This is a video call so there are two streams: audio and video.
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