Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.3 4.3bsd-beta 6/6/85; site ucbvax.ARPA Path: utzoo!watmath!clyde!cbosgd!ucbvax!UCB-VAX.BERKELEY!ihnp4!mcb From: mcb@ihnp4.UUCP Newsgroups: fa.telecom Subject: 10XXX + 1 + Message-ID: <85.10.02.0734.000@ihlpm> Date: Wed, 2-Oct-85 08:34:00 EDT Article-I.D.: ihlpm.85.10.02.0734.000 Posted: Wed Oct 2 08:34:00 1985 Date-Received: Fri, 4-Oct-85 03:09:05 EDT Sender: daemon@ucbvax.ARPA Reply-To: telecom@ucb-vax.arpa Organization: The ARPA Internet Lines: 29 > A related question: Why is it that some areas insist that you dial > 10nnn 1+?? Here in Jersey, if you dial 10nnn and the number you want, you > get a recording that you must "first dial a 1". I thought that 1+ was > implicit in 10nnn+. Down in DC, where I was last weekend, 10nnn+number > works just fine in some areas, but others want the redundant 1. In some areas (areas referring to area codes) all calls outside the area code require 1+ 10 digits. All calls within the area code require 7 digits only. In other areas, all local calls are 7 digits, all TOLL calls (inter- or intra-lata) are 1+ 7 or 10 digits. In the latter case the central office knows if you are going to dial 7 or 10 digits based on the second digit. Area codes have a 0 or 1 as their second digit. Office codes have 2-9 as their second digit. So much for the past... In the last two years areas have run out of office codes, e.g. 312, Chicago. In these areas, 3 digit numbers formerly reserved as area codes are being used as office codes. The central office still needs to know whether or not you are going to dial 7 or 10 digits. The alternative is that the CO has to wait 4-5 seconds after you dial the 7th digits just in case you were going to dial 10 digits. This would upset many people. The way the CO predetermines if you are going to dial 7 or 10 digits is by the existance of the 1+ prefix. This has to apply to 10XXX calls also, since they can be 7 or 10 digits. And that is why some areas require 10XXX + 1+ and some do not. -- Mark P.S. MY work phone number is 312-510-xxxx. 510 used to be reserved for future a area code.