Weird problem: I have two stations, one digital one analog, which both have stutter dialtone when going off hook. This is definitely coming from the PBX, not telco. Neither has messages in their vmail, and I've checked the MW for station to station messaging; nothing there and I've used the MW Cancel feature code just in case. Does anyone know of any reason/feature that would issue stutter dial tone, if it isn't message related?