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SIP/RTP Audio reproduction

Hi!

I'm trying to listen call audio from multiple traffic captures, but the RTP player does not show any waves of sound and obviously doesn't reproduce anything, even though it recognized that there are phone conversations within the packets.

I've been trying all I found on the internet, but nothing works.

I see 3 voip calls, press play, RTP player open showing rtp streams, and blank wave panel, i tried to reproduce rtp streams, nothing happens. Maybe the problem is the Payload type/encoding (GSM)?

Images: Voip Calls RTP Player

https://drive.google.com/file/d/16oHo... https://drive.google.com/file/d/13iKh...

Richard1611's avatar
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Richard1611
asked 2021-07-08 19:20:52 +0000
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Your OS and Wireshark version? Post the contents of the Help -> About Wireshark -> Wireshark dialog.

grahamb's avatar grahamb (2021-07-08 20:27:52 +0000) edit
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@grahamb 

Wireshark version : 3.4.5 // OS: Windows 10, Build (2004) 1904

3.4.5 (v3.4.5-0-g7db1feb42ce9)

Compiled (64-bit) with Qt 5.15.1, with libpcap, with GLib 2.52.3, with zlib 1.2.11, with SMI 0.4.8, with c-ares 1.15.0, with Lua 5.2.4, with GnuTLS 3.6.3 and PKCS #11 support, with Gcrypt 1.8.3, with MIT Kerberos, with MaxMind DB resolver, with nghttp2 1.39.2, with brotli, with LZ4, with Zstandard, with Snappy, with libxml2 2.9.9, with QtMultimedia, with automatic updates using WinSparkle 0.5.7, with AirPcap, with SpeexDSP (using bundled resampler), with Minizip.

Running on 64-bit Windows 10 (2004), build 19041, with Intel(R) Core(TM) i5-4570 CPU @ 3.20GHz (with SSE4.2), with 8133 MB of physical memory, with locale English_United States.utf8, with light display mode, without HiDPI, with Npcap version ...
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Richard1611's avatar Richard1611 (2021-07-08 22:09:14 +0000) edit
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You are correct, the Wireshark RTP player doesn't play GSM. The solution is extract the RTP payload and playback the audio with a GSM player. The Wireshark Wiki RTP Statistics explains how to do it with JMF JMstudio.

BigFatCat's avatar
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BigFatCat
answered 2021-07-09 10:58:09 +0000
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