Yealink
SIP-T48U.
Touchscreen desk phone, receptionist. 16 SIP accounts, 29 line keys.
At a glance
What this phone asks for, and how it finds it
- Vendor
- Yealink
- Family
- Touchscreen desk phone, receptionist
- Capacity
- 16 SIP accounts, 29 line keys
- Provisioning file
- <mac>.cfg
- Other files it requests
- y000000000000.cfg (shared file, no credentials) and y000000000109.cfg (model defaults)
- DHCP option
- Option 66, then 43
- MAC address
- Printed on a label on the underside of the phone, and on the outer box.
The phone checks a custom option if one is configured, then option 66, then option 43, before falling back to whatever address is already saved in its flash memory.
Factory reset
Returning this phone to defaults
Steps
- On the phone: Menu, then Advanced (enter the admin password), then Reset to Factory Settings, then OK.
- This phone's admin password is set per device by this platform and is not the Yealink default. If you do not have it, contact support rather than guessing at the vendor default.
If it does not come up
- Confirm the phone has a network cable in the internet/PoE port, not the PC-passthrough port.
- Confirm the model recorded for this device matches the label on the phone exactly.
- Confirm a line is assigned to the device in the portal.
- If the phone previously worked elsewhere, factory reset it before enrolling.
Worth knowing
What this platform does and does not set
Read before you rely on every key
This model supports an EXP50 expansion module for extra keys at a reception desk. Whether expansion-module keys are addressed the same way as the phone's own line keys is not confirmed in our adapter or in the research this help centre draws from. Confirm against a device configuration export before relying on expansion-module BLF or speed-dial keys for this model.
Next
Set the matching DHCP option once on your own network, and every Yealink phone you plug in after this one finds the platform on its own.