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Call Recording

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This document was generated from CDN thread

Created by: Wes Schochet on 12-05-2010 07:45:07 PM
Hi All-
 
I am trying to come up with a basic call recording routine.  I am able to capture the packets just fine, but have not been able to convert the stream into anything playable. 
 
Up to this point, I have captured the packets, stripped the headers off all of the udp packets and written the results to a file.  This has produced barely discernable.
 
I have tried converting the byte stream from G711 to PCM based on some bit shifting and flipping algorithms like this one:  http://en.wikipedia.org/wiki/G.711.  Also produces very poor results. 
 
Can some one point me in the direction of some documentation or an algorithm to do this?

<font face="Arial" size="2" color="#0000ff">
Thanks - Wes
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Subject: RE: Call Recording
Replied by: Bud Luck on 24-06-2010 11:23:36 AM
Wes,
 
Wireshark allows you to capture an RTP stream and play it back...my experience has been that it works quite well as long as the RTP stream isn't encrypted.
 
Regards
Bud Luck
Cisco
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