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Vonage Well, they can't really check the MAC, because the MAC isn't visible over the TCP/IP
Well, they can't really check the MAC, because the MAC isn't visible over the TCP/IP network. The only network that can see your MAC is the local ethernet network as far as your gateway or the cable modem gateway.
So cloning the MAC achieves you nothing.
The MAC is only significant because the ATA devices use it to find their configuration file on their web server. Their MAC is part of the filename. So if you switch ATA devices, then it won't find a config file prepared for it, and it won't be able to authenticate because it won't know what the secret key is.
The bad news is that the config files with the SIP secret keys are encrypted themselves. The good news is that the key to decrypt the config files is stored in the ATA itself somewhere. If you can extract the keys from the hardware, then you can (eventually) decrypt the config files and find the SIP keys. Or the client certificate, whatever it is that they use.
BTW: does anybody know what instruction set the ESS (yes, the sound card folks) use on the CPU on the sipura/linksys boxes? It would appear it is a DSP chip with a general purpose integer cpu core glued in. But I haven't found any obvious hints as to what core it uses.. it could be a MIPS, an ARM7 or 9, or even a small PPC core. That would have to be known in order to even get to square 1 with understanding the firmware or trying to extract keys from the hardware. Its a huge job to say the least. (Actually, I've kinda lost interest in this part. I returned the PAP2 that I wanted to unlock and bought 4 unlocked PAP2-NA's instead. I'd still love to get the keys though.)
I'm still hopeful that a man-in-the-middle proxy attack might be possible. In other words, you create a SIP proxy that fakes the Vonage SIP servers and connect your ATA to it. You could relay all the real authentication requests to it and have it calculate the responses for you. You'd probably have to have a modem to cause the ATA to initiate sessions in order to make outbound calls. Once the sessions are established you can use the clear RTP packets directly. Those dont have to go anywhere near the ATA. A plain old M.I.T.M. attack would be dramatically less work, but would be just.. nasty.. and not elegant at all. But you probably could automate it for an Asterisk server at home and hide it out of the way somewhere.
Read The Full Thread: Softphone for Main Unlimited $24.99 Residential Service
• To ask simply and directly as possible, why can't you use Softphone software feature
• If you would like an official explanation from Vonage then you need to speak with
• Thank you very much for your reply..
And what you say could very well be true.
In
• I don't have SoftPhone, but I'd guess it's partly to discourage you from sharing
• I wish they'd figure out something reasonable soon. I'm not buying the 'too many
• That doesn't apply to the issue. The question was, why isn't unlimited use of the
• I'd happily give them their motorola ATA back and pay the shipping if they'd only
• ToddlerTN,
I wish I would have worded the subject the way you just did. Very
• Actually, what is really damn annoying is that Vonage *do* offer multiple line,
• Wow very informative post about the business offerings.
I have taken some
peterwemm posted "Well, they can't really check the MAC, because the MAC isn't visible over the TCP/IP" on 04/24/2005 |
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