[152608] in North American Network Operators' Group
Re: VoIP vs POTS (was Re: Operation Ghost Click)
daemon@ATHENA.MIT.EDU (Sean Harlow)
Thu May 3 15:17:48 2012
From: Sean Harlow <sean@seanharlow.info>
In-Reply-To: <51C66083768C2949A7EB14910C78B017018ECD4B@embgsr24.pateam.com>
Date: Thu, 3 May 2012 15:16:58 -0400
To: "Brandt, Ralph" <ralph.brandt@pateam.com>
Cc: NANOG list <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On May 3, 2012, at 14:37, Brandt, Ralph wrote:
> Sean, do you know anyone who has successfully used either to place a
> call? =20
Not to my knowledge. Due to some family in government I'm sure I know =
someone who's authorized for one or the other, but I can't say the =
topic's ever come up. I'm just a telecom geek who gets bored and reads =
obscure documentation.
> I think the weak spot is when the tower overloads nobody can dial
> anything, including the bypass..
That's certainly true, I don't know much about CDMA but in GSM if the =
RACH channel is flooded the phone won't be able to get through with a =
channel request and thus won't be able to do much of anything useful. I =
believe a DoS based on this was demonstrated a few years back, so it is =
a legitimate concern.
The GAO actually did a report on both GETS and WPS a few years ago =
(http://www.gao.gov/new.items/d09822.pdf). Report pages 63-64 (PDF =
pages 68-69) show completion rates during major events of the last =
decade, though comparisons to normal calling in the affected areas =
during the same period are not available. Assuming that normal calls =
did have completion problems, it seems that GETS works well and WPS =
works until the cells get completely flooded as happened during the '09 =
Inauguration.
---
Sean Harlow
sean@seanharlow.info
