By default ATA 187 uses t.38 for faxing, can you change it to Pass Trough? I had a similar issue and that fixed it, I'm still not sure why that made a difference! What fax mchine are you using? Does it support G3 or SG3?
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I know this sounds odd, but try replacing the cable between the fax and ATA to one which just has the single pair wired up. I used to see a lot of odd issues similar to this one with FXS VICs where the cables that came with the fax (with two pairs cabled up) behaved oddly....
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These are the paths to get to each CCX logs through CLI. They may be helpful if you are having issues accessing RTMT or downloading logs through it.
If you want to download them you have to prefix "file get " and you can add one of the options (re...