[Serusers] decoding g729 encoded rtp streams

[İlker Aktuna (Koç.net)]

Hi,

Thanks for the detailed explanation. It's really useful.
I'm trying to automate this whole process. All tools except Ethereal (tcpdump, rtpdump, voiceage decoder) are command line tools that can be used in a batch/shell script.
How can I export rtp stream without using Ethereal, or from command line ?

is there a way ?

Thanks,
ilker
 

-----Original Message-----
From: Andres [mailto:andres at telesip.net] 
Sent: Monday, July 24, 2006 8:18 PM
To: İlker Aktuna (Koç.net)
Cc: serusers at iptel.org
Subject: Re: [Serusers] decoding g729 encoded rtp streams

İlker Aktuna (Koç.net) wrote:

> Hi,
>
> Thanks for the information.
> Actually, I downloaded it but couldn't find how to export rtp payload.
> Does rtpdump read capture files recorded with Ethereal/tcpdump ?
> (in which format should I save the file?)
>
> Btw, there is a Windows sniffer named "Cain & Abel" this one decodes g729.
>
> Thanks,
> ilker
>
First you export the RTP data from within Ethereal like this:
1.  Open Capture
2.  Click on Analyze->Statistics->RTP Streams->Show All 3.  Select the stream you want to export 4.  Click 'Save As'
5.  Then feed that file into rtpdump like the below example 'trace.rtp'.

Here is the command line:
rtpdump -F payload -f trace.rtp -o file.out

file.out will contain just the payload which can then be decoded.


>
>
> -----Original Message-----
> From: Andres [mailto:andres at telesip.net]
> Sent: Friday, July 21, 2006 10:53 PM
> To: İlker Aktuna (Koç.net)
> Cc: serusers at iptel.org
> Subject: Re: [Serusers] decoding g729 encoded rtp streams
>
> İlker Aktuna (Koç.net) wrote:
>
> > Hi,
> > 
> > I know that there are licence and patent issues but is it possible 
> > to decode g729 encoded rtp streams with any software ?
> > I have licenced Eybeam softphone with g729 support. But it can only 
> > decode streams in a conversation.
> > I just need to decode streams recorded with tcpdump/ethereal.
> > 
> > Once I had used a software with this feature but then it turned out 
> > to be a trojan. I don't remember the name now.
> > Is there any other software ? (or method using Eyebeam ?)
> > 
> > Thanks,
> > ilker
>
> You can download the decoder from: 
> http://www.voiceage.com/openinit_g729.php
>
> Then capture the RTP Stream with Ethereal and export the Payload 
> (using rtpdump from http://www.cs.columbia.edu/IRT/software/rtptools/).
>
> You can then decode it with the above software.
>
>
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