[Asterisk-Users] asterisk call start detection

[maka]

Hello,

I have a few astersk servers, talking via SIP to an upstream provider. I
decided to launch a callshop using two Atcom AG168V ATAs, each talking to a
central asterisk server via IAX.

Phone----ATA -----(iax)-------asterisk--------(sip)---------upstream

I am using a billing system , that sits between the ATAs and the phones, and
it detects call start using voltage levels (change of polarity or a 16kHz
signal) geerated from the ATA devices. The billing system on its part
communicates with a PC(runing the billing software) through an RS232
interface.

The problem is, once I dial out the ATAs, the call is successfully put
through the central asterisk server to the upstream provider, but the
billing starts taxing the call as soon as a ringing sound goes back from the
other end, which is before the call actually starts.

Does anyone know of a possible solution, or just any suggestions? Is it
something I can fix with the asterisk server or not?

Thanks
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