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RTP Stream is empty

asked 2020-03-12 20:45:53 +0000

axeldege gravatar image

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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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 gravatar imageChuckc ( 2020-03-12 21:22:41 +0000 )edit
Chuckc gravatar imageChuckc ( 2020-03-12 22:07:20 +0000 )edit

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.

axeldege gravatar imageaxeldege ( 2020-03-13 09:49:22 +0000 )edit

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answered 2020-03-13 15:50:02 +0000

Chuckc gravatar image

updated 2020-03-13 15:53:05 +0000

Enable RTP over UDP:

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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Asked: 2020-03-12 20:45:53 +0000

Seen: 3,339 times

Last updated: Mar 13 '20