[quick reply to just answer some question on open numbering plans.] On 2006/11/06 22:11, Patrik Fältström <patrik@frobbit.se> wrote:
On 6 okt 2006, at 00.06, Otmar Lendl wrote:
In I-ENUM, Telekom Austria (were they to take part in our trial) would use wildcards to direct calls to their ingress point, e.g. by
6.1.4.5.0.5.1.3.4.e164.arpa NAPTR ... "!(.*)!\\1@sip.telekom.at! *.6.1.4.5.0.5.1.3.4.e164.arpa NAPTR ... "!(.*)!\\1@sip.telekom.at!
Which records should Telekom Austria provision under your scheme?
If I understand you correctly, Telekom Austria is running telephony for the number +43 1 5056416, but then you as a user of that number can add whatever digits you want as "extensions" as the routing is prefix based. I presume as long as the number of digits totally is fewer than 15 :-)
Correct.
Can you "port" that prefix from Telekom Austria to someone else?
Yes.
Today, as you point out, there should be a zone 6.1.4.5.0.5.1.3.4.e164.arpa in which you instead of "just" having NAPTR records for the name of the zone, you have NAPTR for the extensions you have.
Example (not open numbering plan):
6.1.4.5.0.5.1.3.4.e164.arpa. IN SOA ... 6.1.4.5.0.5.1.3.4.e164.arpa. IN NS ... 6.1.4.5.0.5.1.3.4.e164.arpa. IN NAPTR ...
With open numbering plan: 6.1.4.5.0.5.1.3.4.e164.arpa. IN SOA ... 6.1.4.5.0.5.1.3.4.e164.arpa. IN NS ... 3.3.6.1.4.5.0.5.1.3.4.e164.arpa. IN NAPTR ... 4.3.6.1.4.5.0.5.1.3.4.e164.arpa. IN NAPTR ... 5.3.6.1.4.5.0.5.1.3.4.e164.arpa. IN NAPTR ...
Correct. This actually quite efficient as you just have to maintain a single zone for the full PBX and not one per extension. (On the other hand, this s*cks for us as the ENUM registry as we can only sell a single delegation to big corporate PBXs.)
How do you handle number portability for these numbers (that end with 33, 34 and 35)? Can they be ported one at a time, or just the whole block at the same time?
Porting is only possible at the number level, not on the extension level. For that example, we can take +43 1 5056416 plus all existing extensions to a different operator, but we can't port out individual extensions like +43 1 5056416 33. (This is similar to the email/domain porting question that came up here at the ietf meeting just now: Domains can be "ported", and take all email addresses with them.)
Good discussion, lets continue.
Indeed. /ol -- < Otmar Lendl (lendl@nic.at) | nic.at Systems Engineer >