Exclusivity is indeed a key part of the performance of the SS7 network. Administrative controls are valid means to accomplish a goal, just like technical and physical controls. Another side of this is the general recognition that you can't rely solely on technical controls to defend against a determined malicious threat. If you've got a huge pile of CAPEX, a fat stream of OPEX, and the careers of several cords of VPs on the line, you think differently than a guy that just figured out how to run asterisk in a vm for his undergrad project. If I can use administrative controls and financial hurdles to exclude those that don't live and breath global stability and uptime, sign me up. David On Thu, Aug 20, 2009 at 7:07 AM, Alex Balashov<abalashov at evaristesys.com> wrote:
David Hiers wrote:
I like the static nature of SS7/PSTN, and wonder how many of those five nines can be attributed to it's static routing. ?Sure, you can translate global titles all day, but you always come back to choosing among a set of static routes to complete your call.
I wonder if some of this has as much to do with exclusivity, i.e. SS7's security-by-plutocracy and/or regulation, as much as with static routing.
-- Alex Balashov - Principal Evariste Systems Web ? ? : http://www.evaristesys.com/ Tel ? ? : (+1) (678) 954-0670 Direct ?: (+1) (678) 954-0671