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- 11:58, 10 January 2023 Admin talk contribs created page 3CX registration fails (Created page with "Registration from 3CX to MOR fails with a similar error: Registration at TEL_0322211033 has failed. Destination (sip:11.22.33.444:5060;transport=TCP;lr) is not reachable, DNS error resolving FQDN, or service is not available. PCAP shows that 3CX sends a '''REGISTER''' packet, receives '''401 Unauthorized''', and again sends the same '''REGISTER''' packet without the appropriate SIP Authentication header. That means that MOR's IP address is blocked on 3CX for some rea...")