On a M7310 ver 21 and 23 I have seen static when accessing an analog line. Accessing digital lines don't demonstrate this problem. It is seen with the same phones across KSU types(CICS, MICS and 8x24). It is also seen with other fresh phones of this version, though the static level can vary. I was just re-visited with this senario just now. I originally saw this some time ago but never got a satisfactory solution then. Any information would be appreciated.