@ms Never mind, and sorry to bother you. This is solved, and must be entirely coincidence that the firewall updated to 159 forced this into the open. After my third call to Voyager, I got a tech who knew what he was doing with the Cisco box, and configured it as above image shows in Line 1 config, explaining that it was because our account had been subsumed from a previous ISP (18months ago!) that things had been changed in the VOIP handling at their end. Why the first two techs didn’t know this is beyond me. But anyway; that done, it works; calls in and out function.
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