thewoose wrote:
Hello all,
I would like to report I have experienced the exact same type of scam on my system. This scammer makes many repeat calls that show in the CDR as 0 or 1 seconds. Somehow they found a way to make simultaneous calls (even though that's disabled) and somehow transfer or put the call on hold so that the system thinks it's been hungup but my provider is charging me for multiple calls at the SAME time from the same scammer.
All of the numbers are prefixes that were listed above. They are using a SIP softphone (Xlite.) Also they seemed random numbers in a row, like 0024, 0025, 0026, etc.
I have blocked all of those prefixes, but I am still baffled at how exactly they tricked my system. Min_duration_2bill is set to 0, but still about half of the calls show up as 0 seconds and status ANSWERED but NOT charged by A2Billing.
Does anyone know of a way to lock down A2Billing to prevent this type of abuse? I have checked everything I know, such as canreinvite is off on all trunks and customers. I am just baffled as to how they are getting away with this, that somehow simultaneous calls are being dialed by the system but NOT being billed, or even noticed for that matter, and then somehow transferred to music on hold and I am getting stuck with huge charges which don't show up in my logs.
Regards,
-Steve
one reason they don't show up could be they are using callback to the extension, check your rates, they might be loophole.
to prevent this we used
1. paypal email verficiation to make sure the owner of the paypal is verifying this payment.
2. we verified the user's phone number by sms to make sure we know which country does he living. if his phone number is verified in china but he is using paypal from US, then the payment is blocked
Regards