Applies to: Furuno FELCOM250 / FELCOM500 FleetBroadband with the handset and terminal interface covered by the UK SIP-registration article. Not FELCOM251/501, FELCOM19 Inmarsat-C or another SIP phone. Match the label and firmware with the ship administrator.
Match your symptom
| What you see | What to do next |
|---|---|
| Confirm the terminal network address with ship IT | Use authorized ship IT or a Furuno technician for administrator settings. Preserve addressing, extensions, passwords and active calls. Do not reset the terminal, create replacement extensions, publish credentials or dial an emergency number as a test. This guide records differences; it does not authorize changing the vessel network. |
| Compare terminal DHCP and handset address mode | Use authorized ship IT or a Furuno technician for administrator settings. Preserve addressing, extensions, passwords and active calls. Do not reset the terminal, create replacement extensions, publish credentials or dial an emergency number as a test. This guide records differences; it does not authorize changing the vessel network. |
| Compare PBX assignment with handset SIP client | SIP Registration Error calls for a local handset/network/extension comparison. Record the exact error before diagnosing satellite reception: handset registration and the external FleetBroadband service are separate evidence. |
Work through these checks
Confirm the terminal network address with ship IT
Furuno’s 2021 article starts with a computer connected by Ethernet. It identifies 192.168.1.1 as a default, and explicitly directs users to ship IT if that address was changed. Do not treat a failed default-address connection as terminal failure or overwrite the vessel’s current address.
What the result means: Use authorized ship IT or a Furuno technician for administrator settings. Preserve addressing, extensions, passwords and active calls. Do not reset the terminal, create replacement extensions, publish credentials or dial an emergency number as a test. This guide records differences; it does not authorize changing the vessel network.
Compare terminal DHCP and handset address mode
The article pairs terminal LAN DHCP set to USE with handset network mode Automatic. Have the administrator read both existing settings and record a mismatch. Do not enable DHCP blindly on a managed network: the ship’s installed addressing plan must be checked first.
What the result means: Use authorized ship IT or a Furuno technician for administrator settings. Preserve addressing, extensions, passwords and active calls. Do not reset the terminal, create replacement extensions, publish credentials or dial an emergency number as a test. This guide records differences; it does not authorize changing the vessel network.
Compare PBX assignment with handset SIP client
Furuno compares terminal Settings > PBX Settings > Extension with handset Settings > SIP > Client set. The assigned number and configured authentication must correspond. Ask IT to compare them privately, including the location note identifying the intended phone. Record which handset fails and whether other registered handsets work before any administrator changes.
What the result means: SIP Registration Error calls for a local handset/network/extension comparison. Record the exact error before diagnosing satellite reception: handset registration and the external FleetBroadband service are separate evidence.
When to stop and get help
Use authorized ship IT or a Furuno technician for administrator settings. Preserve addressing, extensions, passwords and active calls. Do not reset the terminal, create replacement extensions, publish credentials or dial an emergency number as a test. This guide records differences; it does not authorize changing the vessel network.
What to tell support
SIP Registration Error calls for a local handset/network/extension comparison. Record the exact error before diagnosing satellite reception: handset registration and the external FleetBroadband service are separate evidence.
Original troubleshooting guidance based on the official sources below. Menu names can change. This is an independent guide, not a manufacturer service bulletin or a bench-tested repair.