How to save RTP payload as .au or other audio format?

[nangergong <nangergong () gmail com>]

Hi, all:

   I use Wireshark to capture a call between two clients using telephony
software. The codec used is G711 PCMU and comfort noise (PT=CN), as you can
see in picture 1. There are 7 streams altogether, as you can see in picture
2. I want to save the payload as .au file, however, I can only save the
first 5 streams (which only contain some ringing sound or background noise)
as .au files, the last 2 (which contain the speech content) can't be saved
as .au file (but they can be saved as .raw format). The error message is
“Can't save in a file: saving in au format supported only for alaw/ulaw
streams”

When I play back the captured packets using VOIP CALL->Player, I can hear
the sound from only one loudspeaker of the headset(there are two small
loudspeaker in the headset). And if I save the captured RTP packets to .raw
files, the .raw files seem to be damaged files. Very strange.

  So, do you have any idea on how to save RTP payload as .au or other audio
format? or do you think CN payload type is a very big problem? Thank you!

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