Problems provisioning Yealink T23G

[Nozza]

I'm having problems provisioning a Yealink T23G phone.
I have 3CX hosted on a public cloud server, SBC running on a Windows machine in the office.
The SBC hows up in SIP Trunks just fine.
The phone has been updated to the correct firmware (44.84.0.140).
When I reset the phone on the LAN, it connects to the local SBC and then appears in Phones.

However I don't appear to be able to properly assign and extension to it. When I do that, the phone shows up in the User's phones, but when I look at Phones, the Ext. and Name of that phone remains as "New". And the phone itself shows "No Service"

The only options I have for the phone are Add Ext, Assign Ext or Reject. The other options like Firmware, Reboot, Config etc are all greyed out.

I cannot log onto the phones web GUI with either the default password, or the one from Phone Web Page Password in the extension's Phone Provisioning section

 

[JohnS_3CX]

Hello,

Once assigned via SBC, the phone has to download the config from your PBX:

- Is your PBX reachable from where the phone is located? (PBX HTTPS port should be accessible remotely)

- is your FQDN 3CX provided, or do your use your own FQDN / own certs? The phone might not recognize your certificates

 

[Nozza]

Hi. Thanks for the reply

When you say PBX HTTPS port, you mean the provisioning URL? - If so yes, that is reachable from anywhere.

Re: the second question. I don't know. I'm testing out 3CX. I thought I had followed the instructions up to this point correctly but I don't remember setting up certificates.

 

[JohnS_3CX]

I cannot log onto the phones web GUI with either the default password, or the one from Phone Web Page Password in the extension's Phone Provisioning section

This fact about the phone can indeed be problem - if the phone already has a URL stored in it and is somehow "locked down" it will ignore 3CX provisioning.

You need to factory reset the Yealink by holding down the OK button until the Factory Reset prompt appears and then confirming it. Once completed, make sure that you can now login to the phone's UI using admin / admin.

Let's first solve that problem before you proceed any further.

 

[Nozza]

Hi. I've factory reset it already (many times). And when I do that, I can indeed login with the default admin/admin credentials. It's only after the attempt to provision it, that I can no longer log in.

 

[Nozza]

I don't know if this is relevant but in the phones web GUI it does say:

Device Certificate

Factory Installed

 

[JohnS_3CX]

In this case you can check a couple of more things:


a) In you extension, under phone provisioning, have you perhaps set VLAN options?
This can potentially make the device lose network access (ie. it is unreachable)



b) If you lose access after you assigned it, then try logging in using the password found in extension, phone provisioning tab.
Will this work?

 

[Nozza]

Hi. No VLAN set up and not it doesn't accept the password in that section.

I've just noticed that when I factory reset it, I can access the web interface initially. However, if the phone is connected to a LAN that has internet access, then it reboots and updates the config, after which I can no longer log in. Is it possible the phone is hard-linked to some other phone service? It is a used phone.

 

[JohnS_3CX]

Yes it is quite possible that it is. Yealink has a RPS (redirection and provisioning service) that may be remote-provisioning the phone elsewhere.

You would have to contact Yealink and provide them your MAC address to see if they can remove it.

Or you can contact the seller to remove it from their account if you can.