testing 3cx sip server

  1. Solved testing 3CX SIP Server... failed

    I got this issue when i run the Firewall Check resolving 'stun-eu.3cx.com'... done resolving 'stun2.3cx.com'... done resolving 'stun3.3cx.com'... done resolving 'sip-alg-detector.3cx.com'... done testing 3CX SIP Server... failed (How to resolve?) stopping service... done detecting SIP ALG... not...
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