Unsupported Spectralink 8440 - Generic IP Phone Config

[drlive]

All:

I've read through the several posts I've come across in this forum and others and still cannot get the line configured correctly. We're using the hosted version of 3CX, so we have a SBC running for on-prem phones. We've got a few Spectralink 8440 WiFi phones I'd like to use in specific situations (yes, I understand there's DECT phone or the mobile app...just humor me, please). So far I have tried several different configurations for the Line, but haven't been able to get the line registered. Any help is GREATLY appreciated!

Here's the current Line 1 configuration on the phone:

 

[Charles_3CX]

Please note that we do not assist nor recommend the use of generic IP phones, particularly with 3CX hosted instances.

 

[drlive]

Please note that we do not assist nor recommend the use of generic IP phones, particularly with 3CX hosted instances.

I thought this was a forum for the community to respond, not an official support channel? I understand you don't support (thus why it isn't in your support devices) it. Why even offer a Generic IP Phone option?