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Vonage As far as I know it is secure...You have SIP which initiates the call and then RTP

As far as I know it is secure...You have SIP which initiates the call and then RTP stream carries the call and is supposed to be encrypted.

You might be able to get the data, but piecing it back together might take a long time. The social security issue might get resolved first. :)
(eth1 private side)

[pc] [pc]

on the linux firewall, i used the following command before making a test phone call to an automated weatherline (301)797-9797

tcpdump -i eth1 -s 1518 -w rtp.cap host 172.xx.yy.251

after issuing that command, I dialed the number, and listened on the line for ~ 6 seconds. I then killed the capture, and downloaded it to my local XP laptop.

After installing the latest version of ethereal, obtained from ( I opened the capture file by double clicking it....

After opening the file, the SIP protocol could be clearly seen, within the SIP protocol there's a handshake process, where the local device 'invites' the remote peer. This invitation looks like this:

No. Time Source Destination Protocol Info
8 3.728364 SIP/SDP Request: INVITE, with session description

Frame 8 (1275 bytes on wire, 1275 bytes captured)
Ethernet II, Src: 00:12:17:de:d8:92, Dst: 00:02:b3:b3:0f:bd
Internet Protocol, Src Addr: (, Dst Addr: (
User Datagram Protocol, Src Port: 5061 (5061), Dst Port: 5061 (5061)
Source port: 5061 (5061)
Destination port: 5061 (5061)
Length: 1241
Checksum: 0x03d3 (correct)
Session Initiation Protocol
Request-Line: INVITE SIP/2.0
Method: INVITE
Resent Packet: False
Message Header
Via: SIP/2.0/UDP;branch=z9hG4bK-c1eb8f36
From: 443-541-3368 <>;tag=a7c6b5b382060016o0
SIP Display info: 443-541-3368
SIP from address:
SIP tag: a7c6b5b382060016o0
To: <>
SIP to address:
Call-ID: a579d7b7-c0cba5e2@
CSeq: 102 INVITE
Max-Forwards: 70
Proxy-Authorization: Digest username="14435413368",realm="",nonce="424760


Contact: 443-541-3368 <sip:14435413368@>
Expires: 240
User-Agent: 001217DED892 Linksys/RT31P2-2.0.12(LI)
Content-Length: 426
Supported: x-sipura
Content-Type: application/sdp
Message body

Both phone numbers can be clearly seen and is unencrypted. (this re-enforces my previous statement about individuals being able to capture based on phone numbers dialed) I could paste the actual text data contained in the RTP packets, but that would be useless considering it's audio data. This is how one would decode the data if one were to 'obtain a capture'.

1.) open up the capture file
2.) select the first RTP packet listed in the upper window (the window where a summary of the packets are listed) then click statistics in the menu bar, then select 'RTP' which is the fourth entry from the bottom. That menu will then expand into two additional options "Show All Streams, and Stream Analysis". Select stream analysis.
3.) Another window will pop up, with the name "Ethereal: RTP Stream Analysis", don't worry about the data contained in the window. Just look at the buttons down at the bottom of that window. Select the "Save Payload..." button, and specify a file name like "".

At this point, just double click the file (which is at the top of your C drive) and listen.

Congratulations, you just accessed unencrypted data, and have the ability to listen to any conversation you capture.

Here's a thread of an individual asking how to do what I just described:

and here's a url on ethereal's website which describes what to do with the capture once you obtain it:

and here's a capture file that you can cut your newly developed RTP decoding teeth on:|

Speaking of unsecure is xxx-xxx-xxxx your real phone number?

Read The Full Thread:

Security: Lack of response from customercare...

What's the procedure to cancel the service, just call the main number and say i
Anyone taking the time and energy to rebuild and listen to my conversations is
That's where you're mistaken, if vonage is your only service, or you mistakenly
Like I said. While this may be a concern for you, anyone that expends the time and
Maybe Maxwell Smart could loan you "The Cone Of Silence" :-D Seriously, if security
True, and I'd be willing to pay more money. The thing that really pisses me off is
As far as I know it is secure...You have SIP which initiates the call and then RTP
:twisted: I'm busily surrounding my house with lead and searching for hidden
If you'd like, i can provide a step by step demonstration of how easy it is utilizing
If you'd like, I can take you to the cross-box and show you how to put your butt-set

tommy13v posted "As far as I know it is secure...You have SIP which initiates the call and then RTP" on 02/17/2005

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