Of course there is, ever ran an enterprise PBX and had to pay your telco for toll fraud after an extension and DID pair gets pwned? This still happens even in V

Of course there is, ever ran an enterprise PBX and had to pay your telco for toll fraud after an extension and DID pair gets pwned? This still happens even in VoIP and SIP stacks. Seen it first hand, one month, normal billing. Next month, $44,000k in fraudulent calls to and from Cape Town over an enterprise trunk thanks to a poorly configured ATA.