Public ENUM service is using globally allocated DNS zone e164.arpa. Each country can register a domain corresponding to an international prefix. So, for example for Poland (+48) it is 8.4.e164.arpa.
But the real question is? Is it possible to have our "Private ENUM" service? Of course it is
Why would we need it? As an example: we can simplify our dialplan (Private ENUM) or build a peering point with other VoIP service providers (Carrier/Infrastructure ENUM).To make a use from our private ENUM service we will need DNS server which supports NAPTR records. I will use BIND.
At first we need to create our "ENUM" zone. In this example I'm creating e164.atr.
- Code: Select all
/etc/named.conf
zone "e164.atr" {
type master;
notify no;
file "pz/e164.atr";
};
- Code: Select all
/var/named/pz/e164.atr
@ IN SOA ns.e164.atr. hostmaster.e164.atr. (
200911101 ; serial, todays date + todays serial #
8H ; refresh, seconds
2H ; retry, seconds
4W ; expire, seconds
1D ) ; minimum, seconds
;
NS ns ; Inet Address of name server
;
localhost A 127.0.0.1
ns A 192.168.1.20
6.6.7.7.6.6.6.4.4.8.4.e164.atr. NAPTR 10 100 "u" "E2U+sip" "!^.*$!sip:48446667766@pbx1.branch.org!".
Let's check if it is working:
- Code: Select all
[root@atrcc pz]# dig 6.6.7.7.6.6.6.4.4.8.4.e164.atr naptr
; <<>> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5 <<>> 6.6.7.7.6.6.6.4.4.8.4.e164.atr naptr
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 25653
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1
;; QUESTION SECTION:
;6.6.7.7.6.6.6.4.4.8.4.e164.atr. IN NAPTR
;; ANSWER SECTION:
6.6.7.7.6.6.6.4.4.8.4.e164.atr. 86400 IN NAPTR 10 100 "u" "E2U+sip" "!^.*$!sip:48446667766@pbx1.branch.org!" .
;; AUTHORITY SECTION:
e164.atr. 86400 IN NS ns.e164.atr.
;; ADDITIONAL SECTION:
ns.e164.atr. 86400 IN A 192.168.1.20
;; Query time: 1 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Tue Nov 10 18:23:30 2009
;; MSG SIZE rcvd: 147
It is. If IP PBX will lookup for E.164 number 48446667766 (6.6.7.7.6.6.6.4.4.8.4.e164.atr) it will be redirected to 48446667766@pbx1.branch.org via SIP protocol. Thanks to this we can bypass traditional telephony network and connect directly via SIP, perfect!
Cheers,
Cogi
