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Vonage Current mechanisms for blocking traffic rely on Internet packet headers. Even
Current mechanisms for blocking traffic rely on Internet packet headers. Even if you change regular port numbers a simple examination of the headers will reveal that two simultaneous RTP streams connect two points, this is the signature of a Voip call. If you get really fancy you could even see that most of the time, during the session, data is travelling from A->B or B->A but not simultaneously in both directions.
A VPN is a mechanism where you route your data to a trusted computer instead of directly to the Internet. The data is encrypted by you and then sent to the VPN host to be decrypted and sent over the Internet. If you add a VPN into the mix, then the packet headers are hidden from the scanning device. All that the scanning device knows is volume of data from point A to the VPN termination point. It doesn't actually know where the data goes (it can't see point B). However, if all the VPN does is carry one Voip call then the scanning device can look at the signature of the stream (packet spacing, packet size, time between packets) and determine that a Voip conversation is in place. The workaround for this is to put additional traffic on the VPN to confuse the scanning algorithm, you can even extend this to running your Voip over an anonymizing network but this increases latency and might degrade call quality.
I have heard, in the past, that there is a problem running Voip over VPNs. In order to maintain encryption the end points of the VPN regularly exchange keys. I have been told that during these key exchanges the VPN ceases to carry traffic for a short period.
It is likely that Voip will be available for a period of time via VPN tunnels until the problem becomes big enough for the ISP to consider closing the hole.
I have not worked with Narus on a Voip project. I was working for an ISP doing traffic measurement with Narus software. During this period I attended several presentations on the capability of their software. This information is from those presentations. As part of the presentation they would monitor a couple of computers and their system would spit out information about what was being done on those computers, I specifically remember them monitoring video streaming but I recall them discussing capturing records for IP based phone conversations, at the time they talked about monitoring them for billing purposes.
Read The Full Thread: Korea Blocking Service July 1st
• On July 1st Korea will block service because it has considered Vonage illegal
• Screw SSRT, if they block my vonage service in Korea ill dump them in second.
• this pretty lame. i been here in korea over 2 months and i had this phone for 2 months
• I would doubt Vonage is going to do anything for you considering you're violating
• There is nothing Vonage can really do in this case. A foreign government &
• looks like you need to go the VPN route as well if they block access
• I was able to get into the link you posted here's what was on there.
Date
• its not ssrt doing it, its dacom who supplies the entire penn with internet. also
• This bites but it is their right. They are also blocking Packet 8 as well as LIngo
• dammit packet 8 too. how do you know that. i was just about to order that. looks like
scerruti posted "Current mechanisms for blocking traffic rely on Internet packet headers. Even" on 07/03/2006 |
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