Yealink T43U, T46U & T54W: Provisioning and Factory Reset Guide

The Yealink T43U, T46U, and T54W are straightforward phones to deploy — once you know two things Yealink does not print on the box. First, the menu path splits by model: the color-screen T46U and T54W use Menu > Advanced, while the T43U uses Menu > Settings > Advanced Settings for the same functions. Second, almost every support call about these phones is one of three jobs: registering an account, pointing the phone at a provisioning server, or factory resetting it. This guide covers all three, with both menu paths where they differ.

What you need

• The phone, powered by PoE or its model-correct power adapter (see the power notes at the end)
• The admin password — the factory default is admin (see the security warning below)
• For registration: the SIP server address, user name, register name, and password from your phone service provider
• For auto-provisioning: the provisioning server URL from your provider or IT team

Change the default password first

Both the phone's Advanced menu and the web interface ship with the user name admin and password admin. Yealink's own guides say to change it as soon as possible for security reasons, and the phone shows a warning icon in the status bar while the default is still in place. On the phone: Menu > Advanced > Change Password on the T46U/T54W, or Menu > Settings > Advanced Settings > Change Password on the T43U. Enter the old password, then the new one, and save.

Register an account manually (web UI)

1. Find the phone's IP address: press OK on the idle screen, or go to Menu > Status.
2. Browse to that IP address and log in as admin.
3. Open Account > Register and fill in the fields your provider gave you:
   • Label and Display Name — what shows on the phone's screen and in caller ID
   • Register Name — the authentication ID provided by your provider (required)
   • User Name and Password — the account credentials
   • SIP Server > Server Host — the IP address or domain name of the SIP server; the port defaults to 5060 unless your provider specifies another
4. Enable the account, click Confirm, and check that the account registers. If it stays unregistered, re-check the Server Host and Register Name first — those two fields cause most failures.

The same account can be set up on the phone itself: Menu > Advanced > Accounts on the T46U/T54W, or Menu > Settings > Advanced Settings > Accounts on the T43U.

Auto-provisioning

For more than a phone or two, provision from a server instead of typing credentials per phone:

1. Log in to the web UI and open Settings > Auto Provision.
2. Enter the Server URL from your provider, plus the user name and password for the provisioning server if it requires them.
3. Click Confirm, then use Autoprovision Now to pull the configuration immediately. The phone reboots and applies the boot and configuration files — do not power it off or disconnect it during the process.

Phones can also receive the provisioning address by Zero Touch, a PnP server, or DHCP options (66 and 43) — in that priority order — which is how larger deployments avoid touching each phone at all. Reef stocks the full range in our Yealink collection, including the SIP-T46U, the SIP-T54W, and the SIP-T43U.

Factory reset

Warning: a factory reset deletes all personal configuration and returns the phone to factory defaults. Check with your system administrator first — and note the practical catch at the end of this section.

From the phone menu

• T46U: Menu > Advanced (password: admin) > Reset Config > Reset to Factory Settings > Reset > OK
• T43U: Menu > Settings > Advanced Settings (password: admin) > Reset Config > Reset to Factory Settings > Reset > OK
• T54W: Menu > Advanced > Reset Config > Reset to Factory Settings > OK

Long-press OK

With the phone idle, long-press the OK key (about 5 seconds) until the reset prompt appears, enter the administrator password, and press the Yes softkey.

From the web UI

Go to Settings > Upgrade, click Reset to Factory Settings, and confirm. This also resets the administrator password back to admin.

Whichever method you use, the screen shows "Welcome Initializing… Please wait." A reset can take a few minutes — do not power the phone off until it has started up successfully.

When a reset does not stick

• The old configuration comes back after reboot. If a provisioning server, RPS (Yealink's Redirection and Provisioning Service), or a DHCP option still points at the phone, it will pull its configuration again on boot. Remove or update that provisioning assignment, not just the phone.
• The admin password is not "admin" on a used phone. Provider-customized phones can carry a non-default password, and the long-press OK reset can be restricted. On those units, the password may also be re-applied by RPS after a reset — clearing it requires an RPS MAC removal through the original vendor or a Yealink ticket. If you bought the phone used, this is the usual explanation.
• Menu labels differ from this guide. Yealink's guides for this range span several firmware versions (the T4U guide is V85.1; the T5 guide covers V84/V85). Some features are administrator-determined and menu items can move between versions. Follow the function names, and expect small differences.

Power notes

All three models run on standard IEEE 802.3af PoE — none of them needs PoE+. The T43U is Class 2; the T46U and T54W are Class 3, and in practice they draw far less than the class allows (roughly 1.5–3.2W for the T43U, 1.6–3.8W for the T46U, and 2.2–5.5W for the T54W on PoE, per Yealink's datasheets). If PoE is not available, the optional AC adapter is model-specific: 5V/1.2A for the T43U and 5V/2A for the T46U and T54W. Both are 5V, but the current rating differs — use the adapter specified for your model. For the full picture of classes, budgets, and when a phone needs PoE+ instead, see our guide to PoE for IP phones in this Knowledge Base.