[IP] more on VoIP CALEA -- the NSF does work for guess who ? djf
Begin forwarded message:
From: Tom Gray <tom_gray_grc@xxxxxxxxx>
Date: August 9, 2005 9:48:38 PM EDT
To: dave@xxxxxxxxxx, tom_gray_grc@xxxxxxxxx
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@xxxxxxxxxx> wrote:
Begin forwarded message:
From: "ross@xxxxxxxxxxxxxxxxxx"
<ross@xxxxxxxxxxxxxxxxxx>
Date: August 9, 2005 1:10:39 PM EDT
To: dave@xxxxxxxxxx, lauren@xxxxxxxxxx
Subject: RE: more on VoIP CALEA
Reply-To: ross@xxxxxxxxxxxxxxxxxx
Lauren Weinstein <lauren@xxxxxxxxxx> 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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