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The guy on the phone does a test in under a minute and says it shows him +2.5dBmv. So whose lieing? Him or my CM?
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Neither of you - he can't see your modem's figures and you can't see the UBR's figures. Neither of you can see the full picture, unfortunately. There are five readings that matter (plus some others that are rather useful). As far as power levels received go there's an upstream and downstream one. The CM reports the downstream one (which should be roughly -8 to +8 actually, but between the 15s is usually fine too) and the UBR reports the upstream one.
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if you know what you are looking for it does not matter.
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It does actually, I've been trying to get something done about this for years.