a user in a remote office told me when she calls external phone number xxx-xxx-xxxx her display simply goes blank and the call "disappears" (no ringing, nothing). The same thing happens when I try to dial the number from my own office. When I call this number from my cell phone I get a fast busy. Why wouldn't I get a fast busy from my PBX as well? I get nothing. The call just seems to vanish. Both these offices recently switched carriers so is the issue with them? if this number is no good for whatever reason I would think I'd get a fast busy like I do when I call it from my cell phone. thanks for your input.