[VoiceOps] Billing of Forwarded Calls
lriemer at bestline.net
Wed Nov 11 17:49:07 EST 2009
Hmm.... I'll have to check this out.
> Actually I would be far more concerned about the spoofing of refer
> messages, which is one of the message types it doesn't auth. It struck
> me as unusual that it would auth a bye and not a refer.
> On Wed, 2009-11-11 at 16:20 -0600, Lee Riemer wrote:
>> I agree. Shouldn't be too hard if you're sniffing the line, say on a
>> wi-fi connection. Listen for INVITEs, pull dialog info, spoof CANCELs.
>> Nice little DOS attack.
>> Alex Balashov wrote:
>>> Lee Riemer wrote:
>>>> What's wrong with authenticating BYEs and CANCELs? I see them as
>>>> just as important as an INVITE. Anyone can some around, sniff the
>>>> dialog and spoof a BYE or CANCEL.
>>> They'd have to spoof a Call-ID, From and To tags, correct CSeqs, any
>>> loose-routing parameters present in the Route and/or Record-Route
>>> headers, and the Route header itself.
>>> I suppose it *could* be done... but...
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