Self-hosted (on-prem) - Phone configuration after upgrade from v16 to v18

[john1902]

Hello, we have 3CX hosted on-site at our premises. License 3CX Enterprise 16 SC.

We are running 3CX v16 on Debian 9. I am planning to upgrade from Debian 9 to 10 and 3CX v16 to v18 this week. I have read the advice guide and plan to do the following:

1. Go to Backup and Restore, ensure backup was taken within last 24h.
2. Download backup and store on my local machine.
3. Take complete image backup of VM.
4. Click upgrade from 3CX console.

It all looks straightforward and with those precautions I can restore from backup quite easily if something goes wrong. However I have a question about what happens to the phones connected to our system. We have some Yealink T41s phones, they are using a phone template 121899 which I believe has been customized. I did not configure this template as it was by an outgoing IT engineer, however I understand it was customized for some different button settings. When we upgrade the 3CX server, is there a high possibility that something could go wrong with the phones? Or are we generally OK to proceed, and then I would plan to check the phone firmware and template later.

 

[Evolute IT]

The custom templates will be there still and phones should still work.

However, the best will be to recreate your custom templates from the newest official ones, since firmwares and configs may have changed since then and you want to avoid issues.

Better yet, do not use custom templates anymore if you can.