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The Telecom Digest for January 12, 2012
Volume 31 : Issue 11 : "text" Format
====== 30 years of TELECOM Digest -- Founded August 21, 1981 ======
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Telecom and VOIP (Voice over Internet Protocol) Digest for the
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Date: Tue, 10 Jan 2012 06:48:37 -0800 (PST)
From: HAncock4 <withheld@invalid.telecom-digest.org>
To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org.
Subject: LCD developers honored
Message-ID: <1b1cb215-4e4e-4101-b199-562f48b5bd4b@dp8g2000vbb.googlegroups.com>
The Phila Inqr reported that the developers of the widely used liquid
crystal display were honored for their efforts.
4 win engineering's Draper Prize for development of LCDs
You almost certainly have used them today, possibly even
now. Without them, you might find modern life impossible. They
are liquid crystal displays, and they are in billions of
smartphones, flat-panel computer and TV screens, wristwatches,
and calculators.
But can you recognize the names George H. Heilmeier, Wolfgang
Helfrich, Martin Schadt, and T. Peter Brody?
for full article please see:
http://tinyurl.com/7h4q6y7
Date: Thu, 12 Jan 2012 02:59:53 -0500
From: Telecom Digest Moderator <redacted@invalid.telecom.csail.mit.edu>
To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org.
Subject: Some unanswered questions from January 2011
Message-ID: <20120112075953.GC7371@telecom.csail.mit.edu>
Here's a republished version of John Levine's answer to Sam Spade's
questions from January 1st of 2011. I have a couple of added
questions:
1. For calls from and to Vonage customers, is there a Central Office
"switch" involved? In other words, does the voice path from the
originating Vonage customer to the called party "To" number have to
be converted to speech and switched in a central office?
2. What regulatory changes have occured in the VoIP world during 2011?
3. I've heard many comments about "SIP" being a less-than-perfect
protocol. Why is that? Is there any driver to improve it?
Bill Horne
Moderator
----- Forwarded message from John Levine <johnl@iecc.com> -----
To: sam@coldmail.com
Date: 1 Jan 2011 18:52:22 -0000
From: John Levine <johnl@iecc.com>
Subject: Re: Happy New Year!
>I would be especially eager to learn how Vonage really works. It's all
>a mystery to me. Sure, I undersand the transmission method, but I don't
>have a clue about how they "switch" calls and how they interface into
>the PSTN.
There's nothing magic. They have deals with CLECs for local numbers,
and a lot of gateways. When I had a Vonage phone, I did some traceroutes
and it appeared that all of the outgoing calls went over the net to
Vonage HQ in New Jersey and were switched there. Calls to other Vonage
customers went back over the net to the other customer, calls to landlines
went through a gateway to the phone network.
Incoming calls go to whatever CLEC handles the number, and out through
a VoIP gateway. My number was an Ithaca NY number, switched by
Paetec in Syracuse, and I saw the incoming packet stream coming from
Syracuse.
Regards,
John Levine, johnl@iecc.com, Primary Perpetrator of "The Internet for Dummies",
Please consider the environment before reading this e-mail.
http://jl.ly
----- End forwarded message -----
--
Bill Horne
Moderator
TELECOM Digest is an electronic journal devoted mostly to telecom-
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