more on VoIP CALEA -- the NSF does work for guess who ? djf

[David Farber <dave () farber net>]

Begin forwarded message:

From: Tom Gray <tom_gray_grc () yahoo com>
Date: August 9, 2005 9:48:38 PM EDT
To: dave () farber net, tom_gray_grc () yahoo com
Subject: Re: [IP] more on VoIP CALEA -- the NSF does work for guess  
who ? djf


There is no great difficulty in arranging for the
interception of Internet-only voice calls, contrary to
what has been written in earlier messages in this
thread.

At the current time, VoiP protocols have a difficult
time with the address modfications made by NAT's and
how tehse affect firewall operaion. The SIP group ahs
created teh STUN protocol whereby the 'NATed' routable
IP address amy be discovered by theP client so that it
can signal this to the distat client. With certain
common types of firewalls even this is insufficent and
an external voice packet forwarder is required at the
STUN server to be compatible with fireall policies.
SKYPE effectively does the same thing but uses a user
computer hat is not NATed to  mforward voice packets.
This provides the opening for call interception.

It would seem to be very simple for providers such as
SKPE and Vonage to intercept Internet-only voice
calls. The intereception could be done at the packet
forwarder. In most cases the packet forwarder is
required. Even in cases where it is not required, the
client software could be set up to accept a management
instruction amd silently send all packets thorugh a
forwarder without infromting the user.

Tom Gray

--- David Farber <dave () farber net> wrote:


> Begin forwarded message:
>
> From: "ross () stapleton-gray com"
> <ross () stapleton-gray com>
> Date: August 9, 2005 1:10:39 PM EDT
> To: dave () farber net, lauren () vortex com
> Subject: RE: more on VoIP CALEA
> Reply-To: ross () stapleton-gray com
>
>
> Lauren Weinstein <lauren () vortex com> said:
>
>
> > Even if wiretaps were not provided at the VoIP
> data level, they
>
> > could be
> > provided via those interfaces (and only for calls
> using those
>
> > interfaces) *if* the CALEA requirement only
> applies to calls that
>
> > actually were terminating on the switched network,
> and not calls
>
> > that were purely Internet-based between all
> parties.  This aspect of
>
> > the FCC's statement on VoIP and CALEA is not
> currently clear.
>
> >
>
> Apropos the discussion of VoIP CALEA, NB this NSF
> award just made... the
> link to the abstract is not yet live, but I'd
> presume it would be by
> next
> week:
https://www.fastlane.nsf.gov/servlet/showaward?award=0524286

> CT-ISG: Tracing VoIP Calls Through The Internet
> Award#:0524286 Current Year Award Amount:$307,436
> Cumulative Award
> Amount:$307,436 Estimated Total Award Amount:$0
> Original Start Date:Aug 01, 2005 Projected
> Duration:36 Months
> PI: Wang Institution:George Mason University
> State:Virginia District:11
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