Configuring OpenDNS

This page reorganizes the operational steps for Configuring OpenDNS.

A good DNS service is extremely important. Asterisk can performs a lots of DNS requests and it can lock awaiting for an answer. It is strongly suggested to configure OpenDNS servers:

nameserver 208.67.222.222
nameserver 208.67.220.220
nameserver 208.67.222.220
nameserver 208.67.220.222

If your DNS configuration is managed by NetworkManager, edit your /etc/sysconfig/network-scripts/ifcfg...

DNS1=208.67.222.222
DNS2=208.67.220.220
DNS3=208.67.222.220
DNS4=208.67.220.222

If you are using CentOS 9 and derivative distributions, edit your /etc/NetworkManager/system-connections/...nmconnection

dns=208.67.222.222;208.67.220.220;208.67.222.220;208.67.220.222;

OpenDNS is currently being blocking some countries, like France:

dig @208.67.222.222 www.mirtapbx.com +norecurse +comments

; <<>> DiG 9.11.4-P2-RedHat-9.11.4-26.P2.el7_9.16 <<>> @208.67.222.222 www.mirtapbx.com +norecurse +comments
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: REFUSED, id: 10748
;; flags: qr ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 2

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1410
; OPT=15: 00 10 ("..")
;; QUESTION SECTION:
;www.mirtapbx.com.              IN      A

;; ADDITIONAL SECTION:
www.mirtapbx.com.       0       IN      TXT     "The OpenDNS service is currently unavailable in France and some French territories due to a court order under Article L.333-10 of the French Sport Code. See https://support.opendns.com/hc/en-us"

;; Query time: 1 msec
;; SERVER: 208.67.222.222#53(208.67.222.222)
;; WHEN: lun mar 30 21:31:15 BST 2026
;; MSG SIZE  rcvd: 257

In this case, it can be worth using

Cloudflare DNS (1.1.1.1)

Google Public DNS (8.8.8.8)

Quad9 (9.9.9.9)

Current Verification

After applying the change, verify the related MiRTA PBX page, the Asterisk logs, and the relevant Status menu entry. Recheck tenant selection before testing tenant-specific behavior.