In the wiki it states:
When an extension is dialed, the command tagged with a priority of 1 is
executed, followed by command priority 2, and so on. This goes on until:
the call is hung up,
a command returns a result code of -1 (indicating failure),
a command with the next higher priority doesn't exist (note: Asterisk
will not "skip over" missing priorities), or the call is routed to a new
extension.
In the case of a return code of -1, where do we go when a -1 is
encountered? How can I retain control?
For instance, on a Read, if the user enters nothing, I need to continue
execution in a known state.
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