eMG80 with LDP-9030D's using Frontier T1 with Adtran 924 to supply data and analog CO's. Client reports intermittent phantom ring after hang-up on both PSTN and ICM calls, most likely on PSTN calls only... She doesn't remember seeing what the display said during the ring back. I have made over 30 calls trying to duplicate the issue, found no problem. The issue would be between the Adtran and the eMG80. Any ideas? Thanks in advance.