The only thing I can think of is that you have a different app running on side B. I don't believe there's a server wide setting to disabled activity logs, but you can disable it for a whole application in the properties.
I know it might sound silly, but you're 100% sure the call went to this server and this application?
As Chintan mentioned two years ago, it's very possible that the call used one CVP Server for its Call Server service and another CVP server for its VXML service. If you don't see activity logs, then I just can't see how the application got invoked on the VXML server that you were expecting to. A lot of folks confuse this... its the VXML service that launches the CVP applications.
The only other thing I can think of is that someone inserted purge tags into the Global Error Logger with some ridiculous conditions. Can you verify that the CVP servers are not purging files from calls generated today?
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