RTP not showing up in SIP Call Flow

asked 2021-05-05 16:13:23 +0000

kb9mfd
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The RTP is not showing up in the call flows. The RTP is there, I have to find it using the port information in the invite and stp and the packets are there and they are marked / decoded as RTP, but if I go to RTP Streams they are not there either. I have to go to both stream packets and do a Decode As... and set them as RTP even though they are correctly already marked as RTP, then I can do a Stream Analysis, if I do not do the Decode As, then it will not find the reverse. Then I can play them, but only the Forward plays. The graph shows both, but only the forward comes out in stereo instead of one left and the other right. I am using Windows, Wireshark version 3.4.4. Any idea? This is rather frustrating to diagnose a issue.

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answered 2021-11-13 08:58:04 +0000

BigFatCat
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I have learned to accept this behavior, and created a separate profile for RTP/RTCP. My understanding is they added RTP improvements to 3.60. You may want to try it and see if it works any better for you.

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answered 2021-11-12 03:35:34 +0000

Rooster_50

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If the SDP protocol is not present in the capture which setup the streams you are wanting to see, then wireshark by default will not decode the UDP traffic to RTP. In order to do so, go to ANALYZE > ENABLED PROTOCOLS, drill down to RTP, and check the box for rtp_udp (RTP over UDP) and apply. You should now see the UDP traffic decoded as RTP.

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The above procedure enables heuristic detection for RTP which may misidentify some traffic as RTP, hence the reason it's not enabled by default.

grahamb ( 2021-11-12 09:41:56 +0000 )edit

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