3CX registration fails
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Revision as of 11:58, 10 January 2023 by Admin (talk | contribs) (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...")
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 reason.
The solution to enter MOR's IP address into the Whitelist on 3CX as described here: https://www.3cx.com/docs/allow-deny-ip-addresses
