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Hello everyone,

I am trying to create an audio installation for an art show next season which requires live sampling of phone conversations from willing participants. I have turned to Wireshark as a means of recording these calls wirelessly. So far, I have tried to use the "VoIP Calls" feature under the Telephony menu to capture conversations and record them, but the calls i'm making are not being picked up by Wireshark.

Here is my setup: 2 smartphones (both Android) both connected to the same home internet service (Verizon FiOS). My computer is also connected to the same home wifi signal, but when I start capturing packets on this wifi signal I am NOT able to detect the VoIP call being made on these smartphones (using the smartphone app Viber).

Can anyone tell me what I'm doing wrong? Maybe suggest a better method of capturing VoIP calls on my laptop? Also, if there is a way to save these conversations to a folder on my computer AUTOMATICALLY it would save a lot of coding.

Any help would be GREATLY appreciated!

Thank you so much for your time, Sebastian

asked 27 Dec '12, 19:14

seba1685's gravatar image

seba1685
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accept rate: 0%

edited 03 Nov '13, 14:27

Guy%20Harris's gravatar image

Guy Harris ♦♦
17.4k335196


Can anyone tell me what I'm doing wrong?

Your capture setup is possibly not ready for wifi/wlan capturing. Please read the wiki about capturing traffic in such an environment: http://wiki.wireshark.org/CaptureSetup/WLAN

I am NOT able to detect the VoIP call being made on these smartphones (using the smartphone app Viber).

well, even if see the wifi/wlan traffic of the phones, you may not be able to capture 'voip' calls made via viber.com. I don't know for sure, but I'm pretty confident, that they will use their own protocol and I hope they will use encryption, otherwise I would consider viber.com a security failure and not a service ;-). Unfortunately both issues (own protocol and encryption) will make it hard/impossible to extract any valuable information from the captured packets. Anyway, you will see how far you get, as soon as your wlan/wifi capture setup works.

HINT: wifi monitoring mode (see wiki) is not supported on Windows with WinPcap, so if you want to capture the wifi/wlan traffic of your android phones you either have to use a special adapter on Windows (AirPcap) or use Linux as the platform for Wireshark.

UPDATE
Please read the following paper regarding viber security. It explains some concepts (protocol,'encryption/scrambling', etc.)

https://www.os3.nl/2011-2012/students/jeffrey_bosma/courses/ssn/assignments/project

Regards
Kurt

[01/05/2015: Update [wmeier]: The above link appears to require a login]

permanent link

answered 27 Dec '12, 21:40

Kurt%20Knochner's gravatar image

Kurt Knochner ♦
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accept rate: 15%

edited 05 Jan '16, 07:50

Bill%20Meier's gravatar image

Bill Meier ♦♦
3.2k1850

Hi I was trying to access the link above but seems I am not allowed. Is it possible to put it somewhere or to allow viewing?

thank you

Libor

(04 Jan '16, 09:41) Libor Ballaty

The link is external to this site, and I believe is nothing to do with @Kurt Knochner, so we can't help unfortunately. Maybe someone else has a copy of the paper.

(05 Jan '16, 00:25) grahamb ♦
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question asked: 27 Dec '12, 19:14

question was seen: 27,639 times

last updated: 05 Jan '16, 07:50

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