I have a 200icp customer that uses "dds page" programming to talk to internal extensions. Recently when they need to make these internal DDS/pages to each other's extensions the microphone symbol light will light up and they cannot talk back to the calling party without having to go back to the called set and push the lighted Microphone button "off". These folks swear no-one has made any changes in the 200 ICP and for years turning off the lighted Microphone key was not necessary to talk back to the calling party... Any Ideas?