If i have understood correctly while phone rings you see number as "025001500" and on Missed calls you see it a s"25001500". Checki if you have any Calling Party Transformation configured on the phone which is striping "0". Try removing it.
When the call is coming in from the PSTN, from say a mobile: 0494571544 it is showing as ringing on the phone with the number 494571544. No leading 0.
I have looked and cannot seem to see any Calling Party Transformations that would appear to remove a 0. I did a Route Plan Report searching for all patterns that start 4, 04 or 0.04 and the only results were the route patterns to allow internal user to reach the PSTN GW to make calls to those numbers.
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