So we installed a DSLAM for a small hotel in our area. The hotel is using an Iwatsu PBX for the guest phones (that we do not maintain) the customer keeps calling us and saying the DSL modems in the guest rooms are not working. After changing out 40 DSL modems we figured out that the DSL modems loose there config when the message waiting light on the telephone is turned on by voice mail. I guess the 80v MWI light is killing the ROM chips of the modems. Just wondering if anyone has ran into this before or some ideas of what could be done to fix it.