[Asterisk-Dev] AST_FLAG_DEFER_DTMF (would like dialogic-r4 like semantics)

[Kevin P. Fleming]

Steven Critchfield wrote:

> This is already possible. What you may not realise is that any time you
> are playing an interuptable prompt, you need to check the exit status to
> see if digits where received.

And I'll only jump in to the highlight the difference between 
AGI/Background and app_externalivr: in the normal case, you have set up 
a list of digits/keys that are allowed to interrupt the playback, and 
they always will do so. With app_externalivr, you receive DTMF input 
_simultaneously_ with the playback and you can decide whether to 
interrupt or not based on whatever logic you choose.