30 Years of the Digest ... founded August 21, 1981
The Telecom Digest for August 14, 2012
====== 30 years of TELECOM Digest -- Founded August 21, 1981 ======
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Date: Mon, 13 Aug 2012 11:59:38 -0400 From: "Pawlowski, Adam" <email@example.com> To: firstname.lastname@example.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: email@example.com (PV) To: firstname.lastname@example.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.
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