30 Years of the Digest ... founded August 21, 1981
Add this Digest to your personal
or 
The Telecom Digest for August 14, 2012
Volume 31 : Issue 195 : "text" Format
====== 30 years of TELECOM Digest -- Founded August 21, 1981 ======
|
Telecom and VOIP (Voice over Internet Protocol) Digest for the
Internet. All contents here are copyrighted by Bill Horne and
the individual writers/correspondents. Articles may be used in other
journals or newsgroups, provided the writer's name and the Digest are
included in the fair use quote. By using any name or email address
included herein for any reason other than responding to an article
herein, you agree to pay a hundred dollars to that person, or email address
owner.
Addresses herein are not to be added to any mailing list, nor to be
sold or given away without the explicit written consent of the owner of
that address. Chain letters, viruses, porn, spam, and miscellaneous junk
are definitely unwelcome.
We must fight spam for the same reason we fight crime: not because we
are naive enough to believe that we will ever stamp it out, but because
we do not want the kind of world that results when no one stands
against crime. - Geoffrey Welsh
See the bottom of this issue for subscription and archive details
and the name of our lawyer, and other stuff of interest.
|
Date: Mon, 13 Aug 2012 11:59:38 -0400
From: "Pawlowski, Adam" <ajp26@buffalo.edu>
To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org.
Subject: Re: SIT Tones and Robo Calls
Message-ID: <1361B9676B9A41448EB672B89AA7731F110449E614@MBCCR5.itorg.ad.buffalo.edu>
The various SIT tones seem to be used, theoretically, to provide some sort of
in-band signaling, and as far as I know this is how Asterisk's Zapateller and
the "TeleZapper" appliance worked. The Wikipedia article on TeleZapper
describes the scenario though - telemarketers can simply disable the detection
for such a thing, rendering it useless.
Like anything else, it may make a dent in the number of those that get through
to you, it may also confuse people trying to get a hold of you. Some people
have gone as far as whitelisting incoming callers, which could work as well.
Anything works until people figure out how to get around it, which there seems
to be plenty of money in. So, no, they're not required to respect the SIT
tones but it may help, for now.
Adam P KC2YQF
Date: Mon, 13 Aug 2012 13:25:53 -0500
From: pv+usenet@pobox.com (PV)
To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org.
Subject: Re: AT&T sets deadline for 2G sunset in 4 years
Message-ID: <H5qdncDMt9gs27TNnZ2dnUVZ_o2dnZ2d@supernews.com>
Bill Horne <bill@horneQRM.net> writes:
>I thought AT&T was using GSM, and that GSM used TDMA. Are we talking
>apples and oranges?
Sorry, got two things confused. AMPS (analog cellular) is seperately
dead from GSM (which does indeed use TDMA multiplexing). They're still
both dead or dying though.
In response to Thad's question - if your phone can do GPRS, you should be
fine with the 2G shutdown, since GPRS doesn't use the retiring
infrastructure, from what I understand. GSM as a voice protocol still
exists, but running over the 3G (and 4G if you find some) networks. That is
indeed why the interference went away.
On the other hand, you are probably eligible for a free replacement phone
- most carriers let you replace your handset every 2 years or so, and the
batteries on your RAZR are probably getting a bit worn out. *
--
* PV Something like badgers, something like lizards, and something
like corkscrews.
TELECOM Digest is an electronic journal devoted mostly to telecom-
munications topics. It is circulated anywhere there is email, in
addition to Usenet, where it appears as the moderated newsgroup
'comp.dcom.telecom'.
TELECOM Digest is a not-for-profit, mostly non-commercial educational
service offered to the Internet by Bill Horne. All the contents
of the Digest are compilation-copyrighted. You may reprint articles in
some other media on an occasional basis, but please attribute my work
and that of the original author.
The Telecom Digest is moderated by Bill Horne.
This Digest is the oldest continuing e-journal about telecomm-
unications on the Internet, having been founded in August, 1981 and
published continuously since then. Our archives are available for
your review/research. We believe we are the oldest e-zine/mailing list
on the internet in any category!
URL information: http://telecom-digest.org
Copyright (C) 2012 TELECOM Digest. All rights reserved.
Our attorney is Bill Levant, of Blue Bell, PA.
Finally, the Digest is funded by gifts from generous readers such as
yourself who provide funding in amounts deemed appropriate. Your help
is important and appreciated. A suggested donation of fifty dollars
per year per reader is considered appropriate. See our address above.
Please make at least a single donation to cover the cost of processing
your name to the mailing list.
All opinions expressed herein are deemed to be those of the
author. Any organizations listed are for identification purposes only
and messages should not be considered any official expression by the
organization.
End of The Telecom Digest (2 messages)
Return to Archives ** Older Issues