User`s guide

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button will override Silent Emergency and unmute the radio. If this
field is set to Disabled, the Monitor button cannot be used to unmute
the radio.
CAI Data Registration When this field is enabled, the subscriber radio will initiate a CAI data
registration sequence to a host computer connected to the radio
system infrastructure. The radio events that trigger this CAI data
registration sequence include radio power up, mode change, exiting
scan, radio enable, and exiting external keyloading. Failure to register
with the host computer inhibits some RS232 Packet Data operations in
the subscriber radio.
If this field is disabled, the CAI data registration sequence is not
initiated and registration is not required to perform all RS232 Packet
Data operations.
This function will be enabled or disabled on a per ASTRO system basis.
The factory default is Enabled.