CVP here:
Interesting technique. I would never do that. I connect the X node to an ICM script called something like SYS_F_RES (system failure run external script) and this sets a call type and returns END if the call comes from the PSTN and Release if the call comes from CUCM (this is CVP). Setting the call type allows a quick WebView/CUIC report check. Bringing all failures through a single script allows a quick check with Monitor.
(PS: I also have similar little scripts/calltypes for Send 2 VRU failure, DN list failure, queue 2 skill group failure. )
Normally these things only fail in development, when you have the WAV file wrong/missing, the config params wrong. But in production there are the predictable failures (max no entry, max no match) you need to deal with correctly.
I suggest you fix them.
Regards,
Geoff