In some (many?) countries, there are analog lines with reversal polarity as answer supervision. When the called party hangup the polarity back to normal.
In this case analog lines are reliable as digital ones from billing point of view.


BTW, reversal polarity is not a obsolete technology. Here in Peru the telco has state-of-art digital switching with PRI, BRI and CID and reversal polarity for analog lines.

Jorge

Ryan Butler wrote:
It's an analog device, it is picked up whenever it dials.  It has no
sense of when a call is answered on the remote end, if you want accurate
billable seconds you'll need a digital interface like a PRI that can
tell you whether its ringing, or whether it's been picked up.

Ryan Butler
ADI Internet Solutions
[EMAIL PROTECTED]
IAXTEL:  1-700-753-8080 x61
PSTN: 641-753-8080 x61


On Wed, 2004-07-14 at 11:54, Johannes van Hulst wrote:

Is the CDR table the right table for billing?

I did some tests and CDR records billing seconds for calls that where
never picked up.

Is this a bug in my system or is that the way CDR works?



I called out on my X100T card.

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