QQ_Sign.In definition in QQ Application Control

[Checks_out]

Hi, We got a problem with one of the suppliers having a Fortinet FW regularly blocking our traffic because it is tagged as using QQ application, with specific blocking rule being the QQ_Sign.In We have no QQ IM appliaction on our end, we send only SMPP traffic towards the supplier and nothing else. We can't find the exact reason why the rule is triggered, can someone please share some more information on what is that specific rule looking for when filtering the traffic? Is it possible that the rule is triggered for specific SMS messages originating from Tencent?