Hello, I am trying to figure out this buzzing sound we are getting on our phone system. We have a Norstar MICS (0x32) with a T-1 card for our Access Disadvantage. We have 10 channels coming in and every so often we get a buzzing sound on the lines. Both the caller and the Customer Service Rep on our end hear it. When it happens, it makes it impossible to continue the conversation. I have called our carrier and they can see no problems. The buzzing sound does not happen on every call. Any suggestions?