[VoIP] ITAD Gateway

[Steph Kerman]

It's possible that this is intentional and that I gave these folks too 
little credit when I dismissed it before as sloppiness.  OTOH it's also 
possible that I'm about to give these folks too much credit.

Why would they do this intentionally?  Because if you were to connect an 
ATA with internally reversed polarity to any phone jack in the house 
after the feed back towards the CO were cut off, it would appear at the 
other jacks in the house with correct polarity for the same reason that 
using the "T" adapter corrects polarity.  If the ATA had correct 
polarity, it would appear reversed everywhere when patched this way.  
Reading the mfr's installation instructions would be the best way to get 
a handle on whether this idea has any basis.

Unfortunately, if this connection is made and the house wiring is not 
isolated from the outside wiring at the point of entry, the ATA will 
probably be destroyed when it sees 48V DC coming from the CO.

Steph

Jayson Smith wrote:
> Hello,
> Apparently the Packet8 BPA-410 also has reversed polarity.
> Jayson.
>
> ----- Original Message ----- 
> From: "John R. Covert" <john_reads_cnet_via_archives at covert.org>
> To: "CNET" <voip at ckts.info>
> Sent: Wednesday, March 14, 2007 9:25 PM
> Subject: [VoIP] ITAD Gateway
>
>
>   
>> More fun for CNET subscribers.  A gateway to ITAD or ISN (Internet
>> Subscriber Number) dialing is now operating on CNET 1-263-ITAD (4823).
>>
>> ISN dialling uses the format <subscriber-number>*<domain-number>#
>> So, for example, since Free World Dialup has been assigned the
>> Internet Telephony Administrative Domain "262", you would call the
>> FWD echo test by dialling the gateway and then 613*262#.  Or to
>> call any number at UCLA, you would dial the five digit extension,
>> a "*", and then 269#.  For example, UCLA Sports info: 66831*269#
>>
>> There is a list of ITAD-enabled organizations at
>> http://www.iana.org/assignments/trip-parameters
>>
>> You will find a lot of universities and 
>>
>> Not every organization on this list has an operational system accepting
>> calls.  And there aren't any standards for what might be assumed to
>> be a main number.  It's a maze of twisty passages, all different.
>>
>> Have fun.
>>
>> /john
>>
>> p.s.: Wish I'd been paying attention earlier when Jayson was having
>> trouble with his 2500.  I could have told him the IAXy has its
>> polarity reversed.  Since it supposedly doesn't matter anymore,
>> and engineers these days don't know how to read standards (they
>> can't understand "send-correctly, accept-permissively"), we have
>> lots of devices that are backwards, or even worse (the Sipura-3000)
>> actually change polarity under certain circumstances.
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>>     
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