[Bayonne-devel] Virtual macro files, what are they, and how they fit into the bayonne application library

[David Sugar]

I did a few small changes to support "virtual" selection of macro files. 
 This allows you to do things like "virtual tts", and, depending on the 
provisioning, get "tts_theta.mac", "tts_festival.mac", etc, all under 
the tts:: name.  This could also could have been accomplished with 
symlinks, but that was not portable to all platforms.

Besides tts backends, the place I originally had wanted to use this for 
is macros for pbx integration.  This is especially true for all the 
different analog key systems, some of which are very odd.  So the macro 
libraries can have pbx macros for doing basic operations on each type of 
phone system, one can then use the config file to select the one that 
actually is being used.  One can then use a single "virtual pbx" macro 
and use generic pbx::xxx commands, without having to write or hardcode 
values and operations specific to each different switch vendor, such as 
for dialing, hold, and transfer codes.  Other special macros, like 
pbx::answer, would presumably generically deal with switches that have 
dtmf answer integration, like the vm ports on many common keysystems.

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