Path: utzoo!news-server.csri.toronto.edu!cs.utexas.edu!usc!snorkelwacker.mit.edu!bu.edu!telecom-request From: goudreau@dg-rtp.dg.com (Bob Goudreau) Newsgroups: comp.dcom.telecom Subject: Re: When to Use / Not Use the 1 Message-ID: Date: 4 Mar 91 22:57:49 GMT Sender: news@bu.edu.bu.edu Organization: TELECOM Digest Lines: 25 Approved: Telecom@eecs.nwu.edu X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@eecs.nwu.edu X-Telecom-Digest: Volume 11, Issue 182, Message 7 of 10 > I'm confused by what the Moderator is saying here. When an area code > runs out of NNX exchanges and starts introducing NXX exchanges, it > seems that changing intra-area long distance dialing from 7D to 1+7D > is exactly the *wrong* thing for the telco to do, because it > introduces ambiguity. Timeouts would thus be needed to distinguish > between, say, 1-312-4567 and 1-312-456-7890.... > [Moderator's Note: We seem to be back to where we were a couple weeks > ago on this: What you think about the '1' on the front depends on what > your telco has pomoted with /without it over the years. PAT] No, it has nothing to do with that. It has everything to do with ambiguity. If the telco allows intra-NPA long distance dialing using 1+7D, and the telco also uses NXX exchanges (i.e., exchanges that look like area codes) within that NPA, then how does the switch know how many digits will follow "1-NXX-"? Answer: the timeout kludge. Yuck. If the telco were reasonable, it would replace 1+7D with either 1+10D or with 7D, both of which are unambiguous. Bob Goudreau +1 919 248 6231 Data General Corporation goudreau@dg-rtp.dg.com 62 Alexander Drive ...!mcnc!rti!xyzzy!goudreau Research Triangle Park, NC 27709, USA