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3cx Version 11: DNS resolution/Network Failure

Discussion in '3CX Phone System - General' started by adnanj85, Jul 26, 2013.

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  1. adnanj85

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    hi Guys,

    I need an urgent help, all of a sudden my sip trunks have started registering it self and then failing it self.
    It has started from last month and now keeps on bugging every once a week.
    Few days works fine and then again starts giving registration fail DNS/Network Failure issue.
    I have reported My ISP: Response no issue
    Reported Fonet: Response no issue

    Returning Error:
    Event source: 3CXPhoneSystem
    Registration at 7734 **** has failed. Destination (sip:*****@gw1.fonet.dk:5060) is not reachable, DNS error resolving FQDN, or service is not available.

    If i register the same account directly on IP Phone, it gives no error at all, which gives me a conclusion there is nothing wrong with router settings neither the ISP, account registration fails only from 3CX Management Console.

    Please help on it.

    Regards,
    Adnan.
     
  2. kevin

    kevin Member

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    @adnanj85

    A Wireshark Capture would help you to understand if the PBX makes a DNS resolution that fails, of if the PBX makes a REGISTER request to the provider that is ignored or refused in some way.
     
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  3. leejor

    leejor Well-Known Member

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    You could try changing a few settings (depending on how you have it set-up currently) to try to pinpoint the problem.

    Many people simply use their router as a DNS relay, the router usually defaulting to a couple of DNS servers "handed out" by their provider.

    You could try putting the DNS server information into the server/PC running 3CX rather than relaying through the router.

    You could try using another DNS server. A quick search on the net will give you some to try out.
    http://pcsupport.about.com/od/tipstricks/a/free-public-dns-servers.htm

    Google also provides a couple, 8.8.8.8 and 8.8.4.4

    Make note of current settings before changing anything, then, make a change and see if there is an improvement, if not, change it back and move onto something else.
     
  4. kevin

    kevin Member

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    @adnanj85

    This is the sort of issue for which 3CX Support exists ;)
     
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