As an aside, PBX hijacking was how certain Fido BBS operators in the early 90s Hungary got their feed from abroad: a friendly installer left an extension in the

As an aside, PBX hijacking was how certain Fido BBS operators in the early 90s Hungary got their feed from abroad: a friendly installer left an extension in the PBX of the largest consumer bank which gave you a dial tone so very expensive calls abroad were billed to the bank. This went on for a few years.