ℹ️ Use this guide when a guest room phone at the Four Points has stopped working. Every so often a guest phone loses its configuration and drops off its network. When that happens, it falls into the wrong VLAN and stops registering. This guide walks you through getting it back — a reboot, and if that doesn't work, moving it back onto the right network so it can fix itself.
📞 Phone support is provided by NATG, our primary phone vendor —
service@natgisit.ca. The steps below are things you can try yourself first. If they don't resolve it, see Who to Contact at the end of this guide to find out whether the issue goes to NATG or to Argus IT.
When a guest phone loses its configuration, it can't find its way back to the right part of the network on its own. Instead, it drops into the Public VLAN (the 172.31.x.x range) — the phones tend to "hide" there when they lose their config. They need to be moved back to the Phone VLAN (VLAN 10, the 172.30.x.x range), where they can reach the configuration server and provision themselves again.
Most of the time a reboot fixes it. When it doesn't, the steps below move the phone back to the right VLAN, where it can download its configuration and provision itself again automatically.
Keep these handy — they're the values and codes you'll use throughout.
| Item | Value |
|---|---|
| Phone VLAN (correct) | VLAN 10 — 172.30.x.x range |
| Public VLAN (wrong — where lost phones hide) | 172.31.x.x range |
| Dial code (on the phone) | What it does |
|---|---|
**47# |
Reads out the phone's current IP address |
**87*123*10# |
Moves the phone to the Phone VLAN (VLAN 10) |
* + room number (during startup beeps) |
Re-registers the phone to its room |
Unplug the phone (or power-cycle it) and let it start back up.
Reboot the phone once more. While it's making its startup noises, press * followed by the room number.
On the phone, press **47#. The phone will read its current IP address out loud.
172.31.x.x range, the phone is stuck in the Public VLAN (the wrong one). Continue to Step 4.172.30.x.x range, the VLAN isn't the problem. Skip ahead to Stage 3 to confirm it's registered to the right room — and if it is but the phone still isn't working, report it (see Who to Contact below).Press **87*123*10# on the phone. This moves it to VLAN 10, the Phone VLAN. (The 10 at the end is the VLAN number.)
Press **47# again to hear the IP address. It should now be in the 172.30.x.x range.
Once the phone is on the correct VLAN, it can reach the configuration server and should download its configuration and provision itself automatically.
Reboot the phone and repeat Step 2 (enter * + room number during startup).
Once the phone is back up, press **47# one more time to hear its IP address.
The IP encodes the room number, so it lets you confirm the phone is registered to the correct room. For example:
Room 414 →
172.30.14.14
If the IP matches what's expected for that room, the phone is correctly registered and you're done.
⚠️ If the IP doesn't match the room (e.g., you're working on room 414 but it reports a different address), the phone may have picked up the wrong room's settings. Report it (see Who to Contact below) so the configuration can be corrected.
If the steps above didn't resolve the problem, here's where the issue goes.
NATG is our primary vendor for phone support. For guest phone issues you can't fix with the steps above, email them at:
service@natgisit.ca
If NATG needs help from Argus IT, they will contact us directly — you don't need to arrange that yourself.
For a routine single-phone problem that survived the steps above, NATG is your contact.
**47#.💡 Always include the MAC address. The MAC is a unique hardware ID printed on a label on the back (or bottom) of the phone. It's six pairs of letters and numbers, usually written like this:
00:1A:2B:3C:4D:5E(sometimes with hyphens instead of colons:00-1A-2B-3C-4D-5E)The MAC never changes, so it lets the vendor or IT locate the exact phone on the network — which switch port it's plugged into, whether it's drawing power, and whether it's reaching the network — all without being in the room. Including it often lets the problem be diagnosed before anyone has to go to the room.
ArgusIT KB# 100053 | Original: January 26, 2023 (Vincent Kruggel) | Rebuilt: May 25, 2026
Tags: four points, guest phones, guest phone, phone, voip, vlan, phone offline, phone not working, four points phones