Hello, We are experiencing an intermittent buzzing sound on only inbound calls. Only the originator hears the buzzing. Calls come into our class 5 switch via ISUP trunks directly connect to an AT&T tandem. Looking at our EMI report all the calls with the buzz get billed to Century Link. We have tested directly at our hand off to AT&T and were unable to hear any buzzing on an active call where the originator was hearing it. I have been trying to work with Century Link but since we are not a direct customer it has been difficult. I was hoping to find a Century Link Voice Engineer out there I could work with. Please contact me directly. Thank You -- Brian Jenkins Network Operation