Decoding RTP packets G.729

Question

I have a byte array with RTP packets in it.

I am not using a SIP client, I just have the array.

Is there an option to decode the packets in g.729 and then record the voice and save it into a WAV file?

Answer 1

You can find some help here:

http://www.koders.com/csharp/fid5FF057FB1D01EBB06AE9B0DFF096CA01A572D167.aspx

Answer 2

you need a g.729 decoder for decoding the payload from the rtp packets. as far as i know audacity is capable of doing this job. extract the raw data from the rtp stream with wireshark and then decode the audio data ... this should work.

Answer 3

Write rtp byte array to a raw file. Then you can convert that file to mp3 by using ffmpeg.exe with g729 decode command.

ffmpeg.exe -f alaw -ar 8000  -i " + rawFile + ".raw " + rawFile + ".mp3 

Above is the command to convert to mp3.

All the best.