You need to fix that first. Most likely, you were hit by
But based on what you already posted, I’m guessing that the call was rejected because of an invalid caller ID. Confirm that Outbound CID for the calling extension is a valid number and properly formatted.
If that’s not your problem, once logging is working, paste the Asterisk log for a failing call at pastebin.freepbx.org and post the link here.