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Why wireshark capture RTP when portmirroring? why doesn't WS capture RTP if not in portmirroring??

asked 2019-11-08 13:37:23 +0000

updated 2019-11-08 13:40:47 +0000

grahamb gravatar image

Hello, I set simple VoIP testbed.

1 Hub connected with 4 PCs (1 SIP Server, 2 SIP UserAgent, 1 Sniffing Computer)

I installed Wireshark in Server PC and Sniffing Computer.

I did portmirroring between 1 SIP UserAgent and 1 Sniffing Computer.

And I start VoIP Call between UAs.

Wireshark in Sniffing Computer captured RTP, SIP/SDP, UDP packets.

but Server PC did not capture RTP packets but UDP, SIP/SDP.

why did not Server PC capture RTP packet????

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answered 2019-11-08 15:00:12 +0000

Jaap gravatar image

That is because the media stream is setup directly between the UA's, it does not go via the SIP server. That is only there for the signalling, not the media.

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Thank you!

daljaru gravatar imagedaljaru ( 2019-11-08 15:52:41 +0000 )edit

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Asked: 2019-11-08 13:37:23 +0000

Seen: 35 times

Last updated: Nov 08