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RE: [fwd: my comments to the SPAN list]

  • To: "Jim Reid" < >
    < >
  • From: "Stastny Richard" < >
  • Date: Thu, 24 Oct 2002 11:01:40 +0200

> -----Original Message-----
> From: Jim Reid [
] > Sent: Thursday, October 24, 2002 10:35 AM > To: axelm@localhost > Subject: Re: [fwd: my comments to the SPAN list] > > > >>>>> "axelm" == axelm axelm@localhost writes: > > axelm> Yes, DNAME support was added in BIND9. But: DNAME is only > axelm> neccessary if you have such weird things like the "shortcut > axelm> dial prefixes" of Austrian cities (Vienna can be reached > axelm> via the prefix "01", but also via "0222"). > > There may also be a need for DNAME whenever area codes (or > equivalent) get renumbered. [This has happened to London's > area code twice in the last 20-25 years.] An ENUM trial > should explore the use of DNAME for these situations. > This was the major reason for the discussion: area code splits. If anybody is interested, in the hazzles involved with this, see the sections on area code splits in the US ENUM Forum Unified Document 6000. There also the permissive dialing period is defined: Permissive dialing period is the duration of time when the telephone number under either the old area code or the new area code can be dialed to reach the same termination. The length of permissive dialing period is normally a few months and is set by the state Public Utility Commission for each involved area code. And one solution, beside duplication of all relevant zones for the permissive dialing period is DNAME. As Jim said, this is happing all over the world periodically. BTW, only twicein London? The speciality in Austria with +43 1 and +43 222 is, that we have an permissive dialling period with no (yet) defined end. Regards Richard

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