Does the scripting objects allow CAP format files to be converted to WAV/Audio?

I.E. if i have a formatted cap file I have produced from a 3rd party application - would the script allow me to convert it to WAV ?

Thanks in advance

Will

Hi Will,

By "CAP file", I assume you mean packet capture file in tcpdump/ethereal format.

Unsniff can extract VoIP calls from a capture file. Using the scripting interface you can then save these calls to WAV format.

The easiest way to check is to download Unsniff (http://www.unleashnetworks.com/unsniff/unsniff.html) then import the capture file via "File->Import from libpcap". Now switch over to the "User Objects" tab. You should be able to see all the voice calls.

Some important things to remember:

* Unsniff only supports the H.323, IAX2, SIP signalling methods

* Only codecs Linear, G.711a-Law, G.711u-Law, iLBC, GSM can be saved to a WAV file. We dont support G.729 at the moment.


Hope this helps,

Best Regards,
Vivek Rajan

Vivek, Thanks for the response.

You are correct that it is a libpcap/ethereal CAP file.

When I go to file>import

I dont have import from libpcap, I only have
tcpdump
and
Unsniff raw

Am i missing something ??

Thanks again,
Will

Will,

Try "Import From->Tcpdump". Tcpdump and libpcap are the same format.

Check if the calls show up in the "User Objects" sheet.

Best Regards,
Vivek Rajan
Unleash Networks

Hi Again - I import via the TCPDump format and the file loads up into the App but I cant see anything in the User Objects Sheet.

Any clues.

Will,

Any idea about the type of VoIP traffic ? Is it H.323 or SIP or IAX2 (Asterisk) ? Do you see anything in the PDU Sheet ?

Once you get the user objects to show up, writing scripts to save them as WAV files is quite easy.

Regards,
Vivek