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

[Dennis D Hock]

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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