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RTP Stream is empty

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Hi , really hoping someone can help me figure this out.

I have a voice lab setup for university, using Cisco CUCM 11.5 as my call manager and two Cisco IP Communicator phones for my endpoints. So far, I have been able to make successful calls between the two devices and I have captured the RTP streams with Wireshark.

However, when I go to play them back, the RTP stream shows up empty or won't decode. I tried to download a test capture file and play it back, which worked. I have played around with the codecs and signalling protocols but I am not having any luck. I would upload the pcap file but I don't have enough karma. Can anyone help me figure this out?

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axeldege
asked 2020-03-12 20:45:53 +0000
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The preferred method is for you to save the capture file at a public file sharing site like Dropbox, Google, Onedrive,.... make it public (no login needed to access) and post a link to it back here on your question.

Chuckc's avatar Chuckc (2020-03-12 21:22:41 +0000) edit
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May be related to this?:
https://bugs.wireshark.org/bugzilla/s...

Chuckc's avatar Chuckc (2020-03-12 22:07:20 +0000) edit
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Thanks for the suggestion. I'm not sure if it relates to that specific bug. It seems to happen with every RTP stream I capture in my lab setup, no matter how many times I re-open the application. Here is a link to the pcap of my test. https://drive.google.com/file/d/1OUdI...

axeldege's avatar axeldege (2020-03-13 09:49:22 +0000) edit
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Enable RTP over UDP: https://osqa-ask.wireshark.org/questi...

Also, disable the MINT decoders.
Analyze -> Enabled Protocols... : uncheck MINT and MINT (Data)

Working down through the Statistics menu items is a good place to start with a capture file.
Statistics -> Protocol Hierarchy shows a big chunk of the packets were Media Independent Network Transport (MINT)

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Chuckc
answered 2020-03-13 15:50:02 +0000, updated 2020-03-13 15:53:05 +0000
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