What is the default Yealink admin password?

On older firmware it's admin / admin (username admin, password admin). For security, newer Yealink firmware ships with a unique random default password printed on a sticker on the phone (or forces you to set one on first login) — so admin/admin won't work on recent units. If neither works, do a hardware factory reset, which clears the password.

How do I reset a Yealink phone without the admin password?

Use the hardware reset: with the phone idle, press and hold the OK key (the centre soft-key/round key) for about 10 seconds until it asks 'Reset to factory settings?', then confirm with OK. This wipes all settings including the admin password — no login required.

Will a factory reset delete my SIP account and contacts?

Yes. A full factory reset erases the SIP/VoIP account configuration, network settings, contacts and call history, returning the phone to out-of-the-box state. Export or note your SIP credentials first if you'll need to re-register it.

Which Yealink models does this cover?

The same approach works across the SIP-T2x, T4x and T5x families (e.g. T21, T27, T41, T42, T46, T48, T53, T54, T57) and most other Yealink desk phones — the exact key label may differ slightly, but it's the OK/centre key held while idle.

Factory reset a Yealink phone — even without the admin password (2026)

TL;DR — To factory reset a Yealink SIP desk phone you have three options: the keypad menu (needs the admin password), the web UI (needs the admin password), or a hardware key-hold that needs no password at all — hold the OK key for ~10 seconds. The last one is what you want for a used or inherited phone with an unknown admin login. This also covers the 2026 default-password situation: old firmware is admin/admin, newer units ship a unique password on a label.

The default password, then → now

This trips people up, so get it straight first:

Older firmware: username admin, password admin. The classic default.
Newer firmware (security hardening, ~2021 onward): Yealink ships each phone with a unique random default password printed on a sticker (usually on the underside or the box), or forces you to set a new password on first web login. So admin/admin will not work on recent units.

If you have the password, reset from the menu or web UI. If you don’t, skip to the hardware reset — it clears the password entirely.

Method 1 — Hardware reset (no admin password needed)

This is the one most people are searching for. With the phone powered on and idle (not in a call, not in a menu):

Press and hold the OK key — the round/centre key below the screen — for about 10 seconds.
The screen shows “Reset to factory settings?”
Press OK to confirm.
The phone wipes everything and reboots. This takes a minute or two; don’t unplug it.

No login required — this resets the admin password along with everything else. (On a few models the prompt is triggered by holding the X/cancel key instead; if OK doesn’t do it, try that.)

Method 2 — From the phone’s keypad (needs admin password)

Press the Menu soft key.
Go to Settings → Advanced Settings and enter the admin password (admin on old firmware, or the label password).
Choose Reset to Factory (sometimes Reset Config) and confirm.

Method 3 — From the web interface (needs admin password)

Find the phone’s IP: Menu → Status (or Settings → Status).
Browse to http://<phone-ip>/ and log in as admin.
Go to Settings → Upgrade (or Reset & Reboot) and click Reset to Factory.

After the reset

A full reset erases the SIP account, network config, contacts and call history — the phone comes back as if new. Before you reset (if you can log in), note your SIP credentials (server/registrar, username, auth ID, password) so you can re-register it afterward. On newer firmware you’ll be asked to set a fresh admin password on first login again.

Summary

No admin password? Hold the OK key ~10 s while idle → confirm → done. No login needed.
Have the password? Reset from Menu → Settings → Advanced, or the web UI at http://<phone-ip>/.
Default password: admin/admin on old firmware; a unique label password on newer units.
A factory reset erases the SIP account and contacts — save your SIP credentials first.