Solved Unable to Autoprovision SIP-T53

[GrimBurnt]

I am on the 3CX FREE (hosted) plan and am establishing an entirely fresh 3CX system, including new out-of-the-box Yealink SIP-T53 equipment. All of our users are successfully utilizing softphones (and the 3CX apps). Our SIP trunk is working accordingly through Voxtelesys. I have four 3CX users and am attempting to configure a router IP phone under our 32911 (receptionist) user.

The Yealink SIP-T53 is hardware version 95.0.0.0.0.0.0 and was running 95.84.0.95 firmware at unboxing. I followed the instructions here to configure it:
https://www.3cx.com/sip-phones/yealink-t5-series/

However, I was unable to update the firmware prior to adding the phone. The phone downloaded the configuration data; screensaver, date/time, and BLF settings were all showing up on the desk phone. The phone showed a "No Service" message and would not receive inbound or place outbound calls.

Assuming that this was due to not having upgraded the firmware, I was finally able to step-update to the firmware file to: 96.86.0.74. In the process, I factory-reset the phone multiple times and also deleted/added it in the 3CX admin console several times. While I was able to ultimately update the firmware, the phone has not received the provisioning settings again. The screensaver, date/time, and BLF settings are factory default and not applicable to our 3CX user. The phone still shows a "No Service" message.

I've recently attempted the following additional steps:

1. Updated firmware to 96.86.0.76
2. Input 3CX provisioning link directly into "Server URL" field under Auto Provision in phone web app
3. Toggled on/off "Only Accept Trusted Certificates" in the phone web app
4. Multiple reboots and factory-resets

None of the above troubleshooting steps have seemed to help. Any guidance or suggestions on how to get this phone to provision again and eliminate the "No Service" error?

 

[Alejandro_3CX]

Hi @GrimBurnt yes, prior provisioning the phone, it must run the supported firmware

I would suggest the following:

• Delete the phone from the extension and apply the changes
• Factory reset the phone
• Add one more time the phone to the extension as router phone apply the changes
• Plug the device in the network.

 

[GrimBurnt]

Thanks, @Alejandro_3CX! I will try that again. I’m using the factory reset option from the GUI. Is there a more thorough way to reset the phone? Also, reading some other threads, is it possible that the phone has been blacklisted?

 

[Alejandro_3CX]

Please perform the factory reset as mentioned here

If you are in the same network as the phone and the IP is blacklisted, then you won’t be able to access into the webclient which is not you scenario in this moment.

 

[GrimBurnt]

I see, thank you. Just went through the recommended steps again, but no luck. Used the reset process from the phone hardware this time. The phone initializes, obtains an IP address, shows “Config updating” and then “Update skipped” only to return to the Home Screen with no changes.

Should I try adding the phone under another user? I’ve attempted this in the past, but it didn’t have an impact either.

 

[JohnS_3CX]

Factory reset one last time now, without changing anything in 3CX.
Just hold down the OK button on the phone until you see the reset prompt.

It probably got blacklisted earlier from having the wrong firmware, but the ban has probably expired by now.

 

[GrimBurnt]

Solved! Thanks, all for the support!