26 Feb
2005
26 Feb
'05
7:11 p.m.
Java Rockx wrote:
Hi All.
I'm located in the US and would like to comply with the Communications
Assistance for Law Enforcement Act (CALEA) that Congress passed which
basically says that VoIP providers should have the ability to wiretap
conversations for the FBI upon request.
I use mediaproxy for NAT traversal. So my question is how can I be
CALEA compliant? I assume I should be able to modify mediaproxy to
write RTP streams to disk, but I'm unclear on how to "mix" both sides
of the conversation.
Can anyone help with a suggestion?
Here is one suggestion.
Write a simple perl script that does the following:
1. For example if they call you up and tell you to monitor user 5050111
2. Your script will lookup him up in the location table and extract the
IP ADDRESS
3. Then your script will use tcpdump to collect all incoming/outgoing
traffic from that IP.
4. Then you import that capture into Ethereal and will be able to
nicely decode the media stream (if its G711) into a playable file for
any audio program (like Windows Media Player).
5. If you are using other codecs then simply export the RTP stream into
a file and then use other software to decode it. (if its G729 for
example, you can download the decoder from Voiceage).
If you want something more elaborate, you can simply route the
"monitored" subs via an Asterisk server which can save and decode all
audio streams into simple WAV files.
Andres.
Regards,
Paul
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