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Any idea how this Asterisk server would have been added as a route?

These callers that were recorded, were not the ones trying to leverage the hacked server, but rather just dialed the number and were routed through it.

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One common exploit if only one user account is hacked is to set up a forward to a specific high cost number that receives a lot of traffic. There are carriers who aggregate these routes and even blend them in with legitimate routes and then resell them to other carriers at a low cost.

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