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So, this implies that a serious bug in any program with the 'call' hook could prevent your phone from making a call, even 911? Seems like a big deal!

In software I write, the logic for 'emergency' priority events doesn't go through the same call chain for this reason.

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Not an Android expert, but this is how it seems to me.

It's Google's responsibility to implement the hooks in a secure way, so that an app that is registered e.g. for the "call" hook cannot prevent the call from taking place.

Seems that somewhere in there, someone messed up.

The issue is that you might have a device where emergency calls have to be routed through a VoIP app, per legal requirements, e.g. if no cellular emergency calling is available (e.g. on voip-enabled wifi-only devices, or on voip-enabled devices in locations without cellular signal))

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