Yealink phones will not provision over LTE connection

[theketh]

Hi,

My client Desk phones are not provision over an LTE connection.

I setup a new version of 3CX SBC on the server and the phones now appear on the PBX.

I Still cannot get them to provsion.

I have Disabled off SSL/SecureSIP Transport and Ciphers, I have opened ports 5001, 5060 and 5090 on the firewall and the router.

The 3cx version is 18.0 (Build 20) and the phone is a t33g is up to date.

Any advice?

 

[SteveITS]

fw 124.86.0.40?
https://www.3cx.com/docs/phone-firmwares/

Firewall checker passes? Where is the server located? Is your IP blacklisted? If using incorrect firmware that can happen.

 

[leejor]

Which end is LTE, The PBX, or the phones? Is it GCNAT?

Who's LTE are you using, someone using the same provider , may have some suggestions.

 

[theketh]

I do not know how but the T33g's onsite provisioned while the t43u and t46u will not which is bizzar.

No network changes and all phones are on the newest versions.