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How to decode/listen g729r8 RTP codec into an audio file format from a packet sniffer capture?

Posted on 2012-04-01
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Last Modified: 2012-07-12
Hello Experts,

When using wire-shark I'm able to decode g711ulaw or alaw audio rtp codec's into a .wav file format for listening however I'm unable to decode g729r8 into an audible .wav file. If it's possible to decode g729r8 rtp codec's directly from a packet capture (wire-shark, sniffer) what would be the procedure or software tools required for the job. Reason being it would be helpful to decode such codecs when troubleshooting or analysing audio quality (jitter and clipping when dealing with g729r8).

If you know of or have experience in decoding g729r8 voip rtp codec's directly from a packet capture, it would be great to have software, VOD or instructions on how it can be done.

Related links from the forum:
Decode and Listen to G723 / G729 RTP Streams using Wireshark
http://www.experts-exchange.com/Networking/Telecommunications/IP_Telephony/VoIP/Q_23391301.html

In addition to the above question, the method I'm currently using to decode/listen to the g729r8 packets is by using a sip emulator to emulate a basic call using sipp then adding the g729r8 rtp packet collected in the sniffer capture. The call is then sent over a dsp transcoder and the g729r8 rtp packet is decoded and then encoded into g711ulaw on a separate call leg which I again capture (sniffer) and decode the g711ulaw stream using wire-shark. This allows me to listen to the g711ulaw stream sourced from the suspected g729r8 packet or any other audio codec that can be transcoded. However this manual procedure is time consuming and if there was software available or an easier method to do the same job it would save a lot of time.  


Thank you

&

Best Regards,
Edson Pineiro
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Question by:epineiro
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Expert Comment

by:agonza07
ID: 37794499
I like to use Network Instruments Observer, but not sure if g729r8  is a supported Codec. You may want to download a trial and check it out.

http://www.networkinstruments.com

Video on VoIP
http://www.networkinstruments.com/products/presentations/voip/lib/playback.html
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José Méndez earned 2000 total points
ID: 37863684
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Author Closing Comment

by:epineiro
ID: 38181501
Hello Willy,

Thanks for the tutorial, the procedure works perfectly.


Regards,
Edson
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Expert Comment

by:José Méndez
ID: 38181700
Welcome.
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