[Serusers] ENUM lookups

Adrian Georgescu ag at ag-projects.com
Mon Nov 10 17:40:29 CET 2003


Actually you can still use ENUM even before gets widely deployed (read:  
properly delegated). As long as your SIP server and gateways are  
configured to use the DNS servers serving your E164 zone it does not  
matter if the zone is not delegated or your number prefix is not yours.

Shortly said the users of each proxy can benefit of ENUM lookups except  
if the queries are meant for outside zone.

I can for instance use SER to automatically dial the ENUM entry of one  
user and if it fails to use the PSTN gateway. Dialing +31-23-5458104  
SER will first try the SIP address ag at ag-projects.com and if ag is not  
online will fall back to PSTN.

Adrian Georgescu
ag at ag-projects.com
http://ag-projects.com
Tel: +31-23-5458104
IP phone:  sip:ag at ag-projects.com
------------------------------------------------
DNS, ENUM & IP telephony http://managed-dns.org/

On (10.11.03 16:42), Alessio Focardi wrote:
 > E.164 ? sorry for my ignorance, E.164 is the ITU-T recommendation for  
the format
of phone numbers. So, an E.164 number is simply a phone number.

 > Will I need money to obtain a E.164 compliant prefix for my server ?  
If you're talking about ENUM entries:

You would need to have phone numbers for your users plus a ENUM DNS
infrastructure in your country. If you have already a phone number, you
could give your users extensions behind that number.

Unfortunately, there is no ENUM trial going on in Italy yet, so you
won't be able to publish ENUM records for your users in the public DNS
in that case, so other users would not be able to find your users via
ENUM.

But, you could still use ENUM for finding other ENUM users, a currently
small, but rapidly growing community. You won't need to keep a "prefix
to domain" list for all the other VoIP providers, and your users won't
have to remember "which prefix to dial for which provider?"

to see a rough sketch how it works, take a look at our presentation at  
http://enum.nic.at/documents/AETP/Presentations/Austria/0017-2003- 
07_ENUM-Demo_ietf57.ppt I'm happy to supply you with more detail in  
private mail, i consider
that being already quite off topic on the SER users list. Feel free to
contact me.

cheers

axelm
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