[VoiceOps] Hacked Allworx PBXs

One of our customers who sells SIP trunking services is getting a lot of fraudulent calls from one or more customers who have Allworx PBXs. Their understanding is that the Allworx PBX has a back door for technical support access and this has been compromised. We have not verified this information about the Allworx compromise, but we have witnessed the fraudulent calls. Does anyone have more information on this matter? Thank you, Jim Dalton TransNexus