[asterisk-users] More efficient dial plan for a list of selective inbound numbers

[Ryan Bullock]

Catches 555 through 559:

exten => _55[5-9],1,answer
exten => _55[5-9],n,playback(beep)

http://www.voip-info.org/wiki/index.php?page=Asterisk+Dialplan+Patterns
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