[Asterisk-Users] Cisco ATA and a PayPhone

[Madhawa Jayanath]

Mark Johnson wrote:

> Hi Mark,
>
>> I think ATA-188 supports polarity reversal.
>>
>> Cheers,
>> ~Madhawa
>
>
> I hope I don't sound stupid, but what does that mean?  I can't find a 
> definition for polarity reversal and how it would help me.  I do see 
> the 188 supports it, but I'm not sure what to do with it.
>
> Thanks!!
>
> Mark
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>
Hi Mark,
I've done this using SPA-2000, SPA-2000 can generate polarity reversal 
signal, The pay-phone detects "call answer" and "hangup" by revesal signal.
also the pay-phone must be supported polarity reversal detection.

http://www.cisco.com/en/US/tech/tk652/tk653/technologies_tech_note09186a00800a6210.shtml
http://michigantelephone.mi.org/distribute.html

Cheers,
~Madhawa