The Call That Could Have Cost Thousands: Why Every FreeSWITCH, Asterisk & FusionPBX Deployment Needs Real-Time Fraud Protection
"Our SIP trunk is online." "OPTIONS are responding." "Everything looks healthy." And then, within a few hours... Hundreds of unauthorized international calls. Potential losses running into thousands of dollars. A production PBX forced into emergency lockdown. This wasn't a hypothetical security exercise. It was a real production incident that reminded me why building a PBX is only half the job. Securing it is the other half. The Hidden Reality of Open-Source Telephony Platforms like: FreeSWITCH Asterisk FusionPBX FreePBX VICIdial Kazoo OpenSIPS Kamailio CGRateS ASTPP Custom VoIP billing platforms are incredibly powerful. They power thousands of businesses worldwide. But there's a misconception that I still encounter regularly: "If registrations are secure, the PBX is secure." Unfortunately, that's not how modern SIP attacks work. The Incident During carrier integration testing, everything appeared normal. ✅ SIP trunk online ✅ OPTI...