Hello @Arturo
First and most important: Never post support info in the forum. Therefore i have deleted them.
If you are using a non supported provider which is never recommended try using the Generic template as that has more "generic" settings and not specific settings for providers .
Regarding the issue you are facing from the provided files i can see that there is a Cancel message arriving from your provider the same second the Invite arrives.
View attachment 6814
I would recommend contacting your provider and asking them why they the cancel message immediately after the invite. Or use a supported provider that has been tested by 3CX and we can further assist if there is an issue.
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