[VoIP] Line reversals for payphones.....

[Dennis D Hock]

Jayson, Andy,

That is what I was referring to.  I also have one of the channels on my
SPA2K set to provide a line reversal on answer.  I haven't looked at it for
a while and can't recall if it always seemed to come when I would have
expected it.  It definitely was not an immediate type supervision.

Dennis Hock

-----voip-bounces at ckts.info wrote: -----


To: "Voice Over IP Tandem for Analog Switches" <voip at ckts.info>
From: "Jayson Smith" <ratguy at insightbb.com>
Sent by: voip-bounces at ckts.info
Date: 11/05/2007 09:59PM
Subject: Re: [VoIP] Line reversals for payphones.....

My Sipura SPA2K can optionally reverse polarity on answer. I have mine
doing
this, just so I can hear the click when a line is answered.
Jayson

----- Original Message -----
From: "Dennis D Hock" <hockd at dteenergy.com>
To: "Voice Over IP Tandem for Analog Switches" <voip at ckts.info>
Cc: "Voice Over IP Tandem for Analog Switches" <voip at ckts.info>
Sent: Monday, November 05, 2007 3:55 PM
Subject: Re: [VoIP] Line reversals for payphones.....


> Andy,
>
> Are you sure the Sipura doesn't reverse on answer as an option.  It seems
> to me I recall the couple I have being able to option it.  Don't know for
> sure if it really does it or not.
>
> Dennis Hock
>
> -----voip-bounces at ckts.info wrote: -----
>
>
> To: Voice Over IP Tandem for Analog Switches <voip at ckts.info>
> From: Andy Greening <axg at syntec.co.uk>
> Sent by: voip-bounces at ckts.info
> Date: 11/05/2007 03:49PM
> Subject: [VoIP] Line reversals for payphones.....
>
> Gents,
>
> Here's a little challenge to someone who knows far more about * than I do
> ;-}
>
> I have a UAX12 here in Blighty (ok it's off the air at the minute, it's
> just
> moved location at home and I've got to find time to cable it again!) and
I
> have a Pay-on-answer payphone which I want to be able to use on Cnet. The
> problem I have is this:-
>
> For the payphone to work correctly the junction to the * needs to have
its
> polarity reversed when the far end answers, and at certain periods
> throughout the call 'silent line reversals' would be applied to the
> junction
> to give the metering.
>
> I use a Grandstream handytone ATA as my outgoing junction, and AFAIAA no
> ATA
> offers line reversal on answer.
>
> The only way I can see that the line reversals can be done is to have a
> relay card in the * box and when the answer comes from Cnet have some
sort
> of code make a relay on the card change over. The silent line reversals
> would be a bonus, (so that the metering comes from the junction) but is
> not
> critical, as these can be 'spoofed' locally.
>
> Does anyone out there have the skills to give this a go?
>
> Thanks in advance
>
> Andy G
>
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> 05/11/2007
> 04:36
>
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