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In this case, however, things are a bit different. While launching an INVITE scan on a vulnerable PBX system can be useful for the hacker, doing the same thing on an IP Phone (or VoIP Phone) just makes it ring. While some phones will only ring when the correct number is called, others ring when any number (or rather, any SIP address) is specified in the INVITE message. So the attackers/hackers/cyber-criminals ended up getting phones to ring. I think this is a mistake that they were making, possibly because they are not differentiating between a phone and a PBX system
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