"John R. Covert 05-Apr-1991 0904" <covert@covert.enet.dec.com> (04/05/91)
>> The Washington, DC, area has the best plan: 7D is local within your >> own NPA (whether that be 202, 703, or 301); 10D is local to one of the >> other two NPAs; and 1 + 10D is toll, either within your own NPA or to >> one of the other NPAs. 1 + 10D is accepted for local calls to other >> NPAs, and the call gets routed and billed the same as if you had >> dialed just 10D. > This will never be possible in at least one place -- the 516 NPA is > within the LATA from the 212 NPA, and a call carried by NY Tel. > Dialing without the 1+, however, would lead to some sort of time-out > scheme to decide whether one was dialing 516 as an NPA, or just the > 212-516 exchange in 212. From 212, incidentally, all out-of-NPA calls > are dialed 1+, and all 0+ calls, even within 212, are dialed 0+212+7d. > Talk about a full NPA ... It is most certainly possible there -- today. You should have checked before writing: There is no 212-516 NPA. Just as in the DC area, New York has been careful to avoid assigning exchanges that would make this not work. You only lose a few exchanges; in DC there are three that can't be used, and that's it. BTW, "LATA" has nothing to do with it; the only thing that matters is "Local Call." Since nothing in 516 is local to 212 (only to 718), 212 could have a 516 exchange, but they still avoid nearby area codes in order to prevent confusion. The requirement that 0+ calls within your own area code must be dialled 0+10D is in effect not just in 212, but in all the places I mentioned. That requirement is necessary as soon as an area code goes to interchangeable codes. john