3CX not responding register request

[Sebastião Figueiredo]

Hello guys, i'm testing a new video intercom with 3CX, i set the extension configs and sip server on the intercom and it sends the request to the 3CX server which is google cloud based.
The register comes in SIP/XML packages and 3CX just ignores them, attached below.

 

[Sebastião Figueiredo]

I figured out why 3CX was ignoring the register, because the user-agent "exosec" was blocked on 3CX.
Now it will reply the register, but it's replying with "415 unsupported media type", I read that this happens when the codecs don't match, but in this case it's replying when the intercom is trying to register not placing a call.

 

[JohnS_3CX]

You might have trouble with unsupported devices, and judging from the limited info I see above, the content type appears to be wrong