[enum-wg] Delegation of 9.3.e164.arpa / ENUM DNS Quality

Folks,

domain:         9.3.e164.arpa
descr:          Italy ENUM Mapping
nserver:        dns.istsupcti.it
nserver:        dns2.istsupcti.it
remarks:        Ministero delle Comunicazioni - http://www.comunicazioni.it
remarks:        Istituto Superiore delle Comunicazioni e delle tecnologie dell'Informazione
remarks:        http://www.iscom.gov.it

but:

; <<>> DiG 9.2.4 <<>> 9.3.e164.arpa ns @dns.istsupcti.it
;; global options:  printcmd
;; connection timed out; no servers could be reached

and 

; <<>> DiG 9.2.4 <<>> 9.3.e164.arpa ns @dns2.istsupcti.it
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 4925
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;9.3.e164.arpa.			IN	NS

;; AUTHORITY SECTION:
arpa.			3600	IN	SOA	ns1.istsupcti.it. administrator.istsupcti.it. 2006022816 900 600 86400 3600

--------------

Some people seem to view that as they only run a trial (if at all) on
their ENUM country-code delegation, nameserver performance and
reliability does not matter.

This is wrong. ENUM is in production in other countries. A lot of
SIP proxies query e164.arpa for all calls to E.164 numbers.
That includes calls to countries where ENUM is not in production yet.

Calls to Italy are thus running into a DNS timeout. 

This is not good.

So please: Even if you are not in production with your country-code:

     PLEASE MAKE SURE THAT YOUR NAMESERVERS ANSWER. 
     EVEN IF ALL THEY EVER SEND IS NXDOMAIN.

Thank you.

/ol
-- 
< Otmar Lendl (lendl at nic.at) | nic.at Systems Engineer >