Yealink T53 Register Failed.

[DmitryS]

Hi, I can't provision a phone (Yealink T53). Reset to factory, update firmware, provision as a router phone on a cloud based 3CX, restart. But the phone says No Service and the square is red next to the Yealink phone on the 3CX Admin Console. The phone has a warning: Account Unregistered! Thank you for your help in advance.

 

[TheodorosG_3CX]

What is the firmware version of the phone?

 

[DmitryS]

It's the one that 3CX has on its firmware update page - 96.86.0.76

 

[TheodorosG_3CX]

From the PBX side there is no issue.
Can you please, delete the phone from the extension, factory reset and repeat the provisioning process as per guideline below?
• https://www.3cx.com/sip-phones/yealink-t5-series/

 

[DmitryS]

I have tried this half a dozen times from different locations (to make sure it wasn't a modem/firewall issue). I also have a Yealink T42S phone which I tried before purchasing T53. Same result. I am aware it's not a router phone but wanted to try anyway.

 

[TheodorosG_3CX]

After the factory reset, the phone does get the provisioning but fails to register?

 

[DmitryS]

Correct

 

[Vitaliy R.]

Which provisioning method do you use?

 

[TheodorosG_3CX]

@DmitryS Did you resolved this issue?

 

[DmitryS]

The issue is not resolved. I have done RPS provisioning.

 

[SteveITS]

It's the one that 3CX has on its firmware update page - 96.86.0.76

I have not run into it myself with several Yealink models but there have been 2-3 threads stating that downgrading to the .74 firmware is required.

 

[SteveITS]

2-3 threads stating that downgrading to the .74 firmware is required.

@DmitryS :
https://www.3cx.com/community/threads/router-phone-t53w-96-86-0-76.122326/
https://www.3cx.com/community/threa...as-sbc-but-no-service-on-phone-itself.124001/
https://www.3cx.com/community/threads/t-57w-router-phone-which-firmware.122679/

Like I implied though, I just set up a few 5 series as router phones on .76 firmware, so maybe it is hardware specific somehow...