Recently we lost the ability to place international calls because someone called Latvia 252 times in the span of 60 minutes. Absolutely fraudulent phone calls but, we are not able to find any trace of these calls being made from our phone system. We have had a third party review our log files as well as the phone system vendor and no one is able to find anything.
This leads me to believe someone is spoofing our number to make long distance calls and I am curious how is this possible and why doesn't the phone company recognize these are not coming from our circuit?
Also what is the benefit from doing this? The calls are mostly around 5 minutes long to a group of numbers in Latvia. Is this just for malicious purposes to try and cost our company a truck load of money in Long distance fees or is there some other benefit they might be receiving? Why the 5 minute phone calls. About 240 of the 252 were all right around 5 minutes in length.