29 Years of the Digest ... founded August 21, 1981

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The Telecom Digest for May 30, 2011
Volume 30 : Issue 137 : "text" Format
Messages in this Issue:
Re: Pre-paid SIM cards in the US(John Levine)
Re: Need a large PBX.(T)
Re: Busy trunks--subscriber behavior(T)
Re: Busy trunks--subscriber behavior(T)

====== 29 years of TELECOM Digest -- Founded August 21, 1981 ======

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Date: 28 May 2011 22:31:53 -0000
From: "John Levine" <johnl@iecc.com>
To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org.
Subject: Re: Pre-paid SIM cards in the US 
Message-ID: <20110528223153.36937.qmail@joyce.lan>

>> ... SIMs aren't tied to phone numbers.  That relationship is made at the
>> switch.

>Interesting ... in Poland, at least with GSM provider Orange (aka Centertel),
>each starter-SIM you buy comes with phone number already assigned to it and
>printed right on its blisterpack and on its credit-card-sized card-holder
>(right alongside that SIM's PUK number, for that matter :-) ).

That's pretty common in Europe, but it's a marketing thing, not a
technical one.  You will almost certainly find that if you have an
existing mobile phone number you want to port to your new phone, they
can arrange it without changing the SIM.

R's,
John




Date: Sat, 28 May 2011 22:27:45 -0400
From: T <kd1s.nospam@cox.nospam.net>
To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org.
Subject: Re: Need a large PBX. 
Message-ID: <MPG.284b792d716eede6989d35@news.eternal-september.org>

In article <MPG.28268edc4eb34603989d31@news.eternal-september.org>, 
kd1s.nospam@cox.nospam.net says...
> 
> In article <20110429145233.54654.qmail@joyce.lan>, johnl@iecc.com 
> says...
> > 
> > >Call your Nortel rep.  They will actually talk to you.
> > 
> > Nortel?  They're in the process of being dismantled.  Who bought
> > their PBX business?
> > 
> > R's,
> > John
> 
> Didn't Google buy a bunch of Nortel's patents? 
> 
> And here's my take on VoIP systems, particularly Cisco. Not bad at all. 
> And they don't need any special networking anymore. 
> 
> In fact my Cisco phone at work has my Ubuntu box hanging off it. 

Oh but I should add something I just ran into. I don't like the fact 
that the Cisco phones package up voicemails as a wav file and then email 
it to you. So if I come into the office and see the message waiting 
LED's lit, I'll get the voicemail fromt the phone. If you do that it 
never forwards the voicemail to email. 

Well this past Friday I listened to my message, deleted the message and 
the LED's never extinguished. It was that way up until I left for the 
day so I filed a help desk ticket. We'll see what happens when I go in 
on Tuesday. 




Date: Sat, 28 May 2011 22:32:15 -0400
From: T <kd1s.nospam@cox.nospam.net>
To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org.
Subject: Re: Busy trunks--subscriber behavior  
Message-ID: <MPG.284b7a37f34f6934989d36@news.eternal-september.org>

In article <LfudnW3r6shd_VzQnZ2dnUVZ_gednZ2d@giganews.com>, 
sam@coldmail.com says...
> If a lot of subscribers remained off-hook, no harm, no foul, unlike a No 
> 5 XBAR, which could crash given sufficient permanent off-hooks.
> 
> 

That's because the 5 XBAR used the markers for everything and being that 
markers were nothing but logical arragangements of relays, and limited 
depending on the office design, it was a fairly simple matter to 
overwhelm them. 

But those markers were the second or third brush at common control. The 
hybrid then digital systems that replaced them benefited from lessons 
learned. 




Date: Sat, 28 May 2011 22:33:36 -0400
From: T <kd1s.nospam@cox.nospam.net>
To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org.
Subject: Re: Busy trunks--subscriber behavior  
Message-ID: <MPG.284b7a90bd88e69d989d37@news.eternal-september.org>

In article <5e292$4dc31908$4038ffec$28817@PRIMUS.CA>, gwelsh@spamcop.net 
says...
> 
> Stephen wrote:
> 
> > and modems can be even worse.....
> 
> On a slightly different but somewhat related topic:
> 
> I seem to recall ILECs complaining that long modem connections were
> playing havoc with their provisioning plans... despite the growth of
> the overall market, the fate of companies like AOL suggests that the
> number of dialup users has shrunk.  I wonder how much the factors used
> in provisioning planning changed as broadband replaced dialup as the
> most common connection type?  Perhaps the high availability of trunk
> capacity mentioned in this thread is - at least in part - the result
> of capacity added during the dialup heyday and underutilized since?
> Or have technology upgrades over the past decade or two simply
> provided so much capacity that voice traffic can't normally put a dent
> in it?

Well, a lot of the ILEC traffic is moving off the traditional switched 
network into VoIP services. Sure, it ultimately hits a switch somewhere 
in the chain but it's a purely digital signal so easy to mix into a time 
or frequency domain. 





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