Issues with registration since upgrading to v20

[Alphabetic]

Hi support

I took an on premise installation to v20 yesterday and had issues with phone provisioning.

PBX and phones are on the LAN.

Split DNS is set up.

I've got floods of entries in the event log 12291 - Block WAN requests is ON - Why does this apply when they're all local?

WAN IP and LAN Subnet are whitelisted.

When I use the FQDN under account / SIP the phone doesnt register.

Changing it to the LAN IP and it works but it reprovisioned with the FQDN and it gets kicked off again.

Phone is a Yealink T46S 66.86.0.15

 

[HighTechIT]

My procedure:
Using the 3CX Web Console URL link login to the Yealink phone.
Settings > Auto Provision, delete :5000 from the provisioning URL > confirm.
Reboot Phone by Settings > Upgrade > Reboot.
Push firmware upgrade from 3CX to Yealink Phone.
Yealink phone is back under control of 3CX.

Repeat X 30 phones