[arm-allstar] prefix adjustment

[Dan Keizer]

Hi there ... been using the latest edition with the DMK interface for a
while, and learning.  I love asterisk as a back-end.

I'm searching and looking for a while and can't quite seem to find a yes/no
discussion or how to on this.

I'm interested to know if its fairly easy to change the prefix so not to
use "*" and "#", but to use a different dtmf, such as "A" as the command
prefix.

Looking at testing out some private node configurations and want to see how
this might work in a different environment.

Reason is, looking at testing/showcasing this unit as a link connection to
replace an existing UHF connection.  Given the existing UHF RF backbone
becomes "hot" and routes the audio to the connected nodes, all existing
controller dtmf traffic can be sent around etc, would want to exclude the
new unit to not respond to any of those existing RF dtmf tones.  So, it
would be used in a system as just another node on an existing controller -
where these controllers can talk to each other over the "uhf" backbone.

At some point, it may actually move to using asterisk as a controller -
time will tell how well this is received and moved along.

any input welcome.

73, Dan ve4drk
testing node: 45427