[VOIPSEC] Voice or Not -- Fake Voice Packet???

[Russell Howe]

On Mon, Oct 03, 2005 at 02:06:51PM -0500, Mark Collier wrote:
> It is possible and I believe there is even an application available, to use
> a VoIP call to "tunnel" data. Sort of a new generation modem. This is a
> slow, potentially lossy way to tunnel out data, but it is possible.

Well of course it's possible, you can encode binary as an alternating
tone or even a series of beeps or clicks... so long as you have timing
information (8B10 or manchester encoding or the like) then you can
recover the bit stream fairly reliably.

Of course, if you want any kind of decent transfer rate, then things get
a bit more complex...

You could also tunnel data in SIP headers too, I expect.

-- 
Russell Howe       | Why be just another cog in the machine,
rhowe at siksai.co.uk | when you can be the spanner in the works?