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Transcribing audio from dynamic RTP's

asked 2019-06-20 18:03:48 +0000

hugeyeti gravatar image

When I select Telephony --> RTP --> RTP Streams, my customer's pcap shows dynamic RTP's (RTPPayload type 104, 109 and 97. Since I know these are dynamic (most probably video), is there any way for me to listen to the audio?

Example:

Source Adreess: 1.1.1.1 Source Port: 2000 Destination address: 2.2.2.2 Destination port: 3400 SSRC: doesn't matter Payload: RTPType-104 Packets: 16409 Lost: 70 (0.4%) Max Delta: 39.922

Any input would be greatly appreciated.

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answered 2019-06-20 21:33:32 +0000

Jaap gravatar image

You'll need to have the media session protocol captured as well (e.g., H.245 or SDP) in order to know what dynamic codec is negotiated.

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In the filters section, I put in 'sdp' but nothing comes up. RTP's are there but dynamic.. oh well.. not possible to decode then. No sip capture either (i was hoping for some clues) with at least a 200ok sdp header.

hugeyeti gravatar imagehugeyeti ( 2019-06-20 21:44:26 +0000 )edit
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Asked: 2019-06-20 18:03:48 +0000

Seen: 1,028 times

Last updated: Jun 20 '19