1. Check IP Settings for correctness.
2. Ensure DNS is configured if hostnames are specified for SIP Server entries.
3. Ensure SIP Server, Proxy, User, Password, Authentic(ation) ID [if needed] settings are correct.
4. Ensure Firewall permits SIP UDP traffic OR TLS connections (only Viking X-series products support TLS)
5. Enable the Debug panel by pressing <Ctrl> <Shift> <V> in IP Programmer Tool or Viking Device Manager:
This will reveal log messages from the intercom.
Search down any SIP error codes "nnn" for resolution.
6. Ensure "Register Fails" dropdown is set to: "Re-Resolve":
7. Configure "Login Security" on last page for protection from port/security scanning tools:
