disa {name} Create a DISA menu
	context  - Default context to allow access to
	mailbox  - Default mailbox for stutter-tone
	timeout  - Timeout in seconds
	passcode - Fallback passcode (if no entries)

disaentry  Add an entry for the DISA menu
	disa     - parent disa to add to
	passcode - Passcode for entry
	context  - context for this entry to allow access to
	mailbox  - Mailbox for stutter tone
	callerid - Override Callerid

example: 
config 'disa' 'disagroup'
   option 'context' 'foo'
   option 'mailbox'  '1001@default'

config 'disaentry'
   option 'disa' 'disagroup'
   option 'passcode' '12345678'
   option 'callerid' '"Jo Blo"'

config 'disaentry'
   option 'disa' 'disagroup'
   option 'passcode' '455667'
   option 'context' 'bar'