Why convert a packet capture to wav file ?
- We all know how useful a packet capture could be while troubleshooting. While troubleshooting issues related to voice quality, one way audio and many more require us(TAC) to collect packet capture(sniffer) and then convert it to a wave file so that we could listen to it.
Software Required
- Cisco Unity(Any version)
- Wireshark or ethereal or any packet capture tool
Procedure
- Using wireshark/ethereal collect a packet capture.
- Open the sniffer trace and then save it as .cap file.
- Select "Network Associate 2.0(x) version" as the save type.
- Go to any Unity Server
- Go to \Commserver\Utilities\Audio and you will see "capripper.exe" tool
- Put the .cap file in that folder.
- Open up command prompt and browse to the \Commserver\Utilities folder
- Then issue the command "capripper "filename.cap"
- That should generate a .wav file
- The wave files would be located in \CommServer\Utilities\Audio folder.
Note:- There's a possibility that the codec used for RTP exchange was g729. A normal windows media player won't be able to play this file. I've tried a couple of players - VLC, Real, QuickTime and a couple of others, however all fail to play the file.
How to Play wave files which have a codec g729 ?
- Copy this executable (sl_g729a_setup.exe) from Cisco Unity to your PC
Location -> \CommServer\Utilities
- Run the executable and reboot PC, now Media Player can be used to play these files.
