"digital sets do not produce DTMF on icm calls"
That's what I was sort of wondering myself but on a 7208 phone there isn't a soft touch "open" button so technically you are pushing the 6 and sending a tone.
Plus, Dave has told us that he can hear a tone coming from the door phone speaker as long as he holds the button down on his buttset.
I asked a Nortel guru here in my area about it and he thinks it has something to do with offsite restrictions. He says an ATA, even though connected to a station port, acts like a trunk call. It's the same as calling in from offsite and accessing the door. That's why I suggested the cell phone transfer and it should work even without line appearances providing at least one intercom is assigned to the door phone.
On the topic of HG or ringing multiple DN's, I normally use a third party solution as well but that's the advantage to using a Nortel unit. The Nortel unit can page a "chime" sound to multiple phones.
