This is our old Q&A Site. Please post any new questions and answers at ask.wireshark.org.

Hi all,

I use a router called AVM Fritzbox 7270 with Linux Ubuntu 10.10. The router has a hidden feature to capture network traffic. It allows me to produces .eth files that can be analyzed via wireshark.

In order to generate an audio file I use the following procedure:

  1. generate a .eth-file and save it to hard drive.

  2. Wireshark->Telephony->RTP->Show all Streams

  3. Select Stream -> Analyze -> save payload

  4. Choose a name of the audio file, set "Format" to ".au", set "Channels" to "both"

In particular the last step does not work to full satisfaction. I get an error message:

can't save reversed direction in a file: File I/O problem!

All I can do is to save audio files using "Channel" as "forward". Both, "reversed" and "both" do not work. From a test call I have 2 audio streams available. Both streams have been converted into audio files using "Channel" as "forward". The first audio file covers only what I said, whereas the second audio file covers only what the other person replied. Of course, I would like to have an audio file that contains the telephone call completely.

I use 2 different DECT telephones, which are only 3 months old:

Siemens Gigaset E36, Codec G.726. Siemens Gigaset SL400H, Codec G.722, G.726.

Is it due to the codecs used by the phones? What can I do?

When looking at Telephony -> VoIPCalls -> Graph there are fat arrows in both directions tagged as "RTP (g711A)" if this helps. Nevertheless, using the "Player" button I can only listen to what the other person said.

Thank you very much indeed for any help.

Regards,

Walter

asked 27 Dec '10, 06:02

erichm's gravatar image

erichm
1112
accept rate: 0%

edited 28 Dec '10, 03:36

You never told which version of Wireshark you use, and on what platform.

(27 Dec '10, 10:39) Jaap ♦
Be the first one to answer this question!
toggle preview

Follow this question

By Email:

Once you sign in you will be able to subscribe for any updates here

By RSS:

Answers

Answers and Comments

Markdown Basics

  • *italic* or _italic_
  • **bold** or __bold__
  • link:[text](http://url.com/ "title")
  • image?![alt text](/path/img.jpg "title")
  • numbered list: 1. Foo 2. Bar
  • to add a line break simply add two spaces to where you would like the new line to be.
  • basic HTML tags are also supported

Question tags:

×238
×25
×12
×10

question asked: 27 Dec '10, 06:02

question was seen: 38,376 times

last updated: 28 Dec '10, 03:36

p​o​w​e​r​e​d by O​S​Q​A