Solved

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

Posted on 2012-04-01
4
1,227 Views
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
0
Comment
Question by:epineiro
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
4 Comments
 
LVL 20

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
0
 
LVL 20

Accepted Solution

by:
José Méndez earned 500 total points
ID: 37863684
0
 

Author Closing Comment

by:epineiro
ID: 38181501
Hello Willy,

Thanks for the tutorial, the procedure works perfectly.


Regards,
Edson
0
 
LVL 20

Expert Comment

by:José Méndez
ID: 38181700
Welcome.
0

Featured Post

Will your db performance match your db growth?

In Percona’s white paper “Performance at Scale: Keeping Your Database on Its Toes,” we take a high-level approach to what you need to think about when planning for database scalability.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Article by: user_n
How Sip Phone (User Agent) works and communicates with sip servers 1.  There is a sip server and a sip registrar.  The sip server and sip registrar can be one server or two different servers. The sip registrar is the server on which it is record…
PRTG Network Monitor lets you monitor your bandwidth usage, so you know who is using up your bandwidth, and what they're using it for.
Here's a very brief overview of the methods PRTG Network Monitor (https://www.paessler.com/prtg) offers for monitoring bandwidth, to help you decide which methods you´d like to investigate in more detail.  The methods are covered in more detail in o…
NetCrunch network monitor is a highly extensive platform for network monitoring and alert generation. In this video you'll see a live demo of NetCrunch with most notable features explained in a walk-through manner. You'll also get to know the philos…
Suggested Courses

623 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question