T46s on Version Number 18.0 (Build 418)

[drqasap]

We cannot get the phones to auto provision using the phone ip address. The phone was working fine but we did factory reset. Now it will not provision.

 

[JohnS_3CX]

Hi there,

Too many unknowns, why don't start from here first so we know what we are looking at:
https://www.3cx.com/community/threads/post-in-relevant-category.115838/

 

[drqasap]

3CX Version, Professional Annual 18.0 (Build 418)
Is the 3CX Server Hosted and where? Hosted in AWS
IP Phone Make/Model/Firmware version, Yealink T46s version 66.83.0.55
Provisioning Method: STUN
Trunk Provider or VoIP Gateway Make/Model, T4
Has the Firewall Checker passed: YES
Are custom Phone Templates being used: YES

 

[JohnS_3CX]

Before this phone is used, you need to factory reset it and then upgrade the firmware with what you see here:
https://www.3cx.com/support/phone-firmwares/

The phone is currently running a much older firmware though, and it will probably reject the version we provide.
You need to go on Yealink's website, and get the versions that you missed so you can upgrade it step by step until you reach a version that allows you to install our firmware.

Note: STUN + custom templates will be a challenge, even after you upgrade the firmware to the desired version. We recommend to use remote phones with a 3CX SBC and avoid STUN if you can. https://www.3cx.com/docs/3cx-tunnel-session-border-controller/