Solved Registration at CallCentric Main has failed. DNS error resolving FQDN, or service is not avail

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edokim22

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"Registration at CallCentric Main has failed. Destination (sip:204.11.192.23:5060;lr) is not reachable, DNS error resolving FQDN, or service is not available."

Have been getting this error for the past 3 days. I reached out to Callcentric and they said it was probably GCP issue. I tried restarting the machine, changing to a new machine, and even moving the PBX to 3CX hosted. Nothing solved the issue. I keep getting the same error.

We are unable to make any external calls, thought internal calls work.

I tried using the hard IP Adress instead of callcentric.com,and that seems to succeed temporarily in establishing the connection and being able to receive calls. But we still cannot make outgoing calls, and after some time, it goes back to not connected.

Using Dynamic IP and 3cx FQDN. Version 18.0 Update 3 (Build 450).

Have had this installation working for two years with no hiccups until suddenly this came up. Could it be related to the change to activate.3cx.com.?

Thank you in advance,

E

Update:
Finally figured it out. Callcentric IPs were being automatically blocked - why, I have not idea. But after unblocking the ports, everything is working fine.
 
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Glad to see you got it working. You can add the Callcentric IPs in your whitelist to prevent this from happening again
 
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