Motorola MCS 2000 User Manual page 220

MDC Unlimited Calling
Tx Inhibit On Busy
214
This field will be visible only if the Selective Call Encode field is set to
Enabled. Use the UP/DOWN arrow keys to enable/disable Unlimited
Calling. If this option is enabled, the user will be able to directly enter
from the keypad IDs of radios he or she wants to call. Target Radio ID
selection via the programmed Call List instead is still a valid option
available for models so equipped.
Note: To be able to take advantage of this feature, a radio must be
equipped with a numeric keypad. This option affects only the Call
Alert Encode and Selective Call Encode features.
The default is Disabled.
Use the UP/DOWN arrow keys to enable/disable the MDC Transmit
Inhibit on Busy Channel option for this personality. When this option
is enabled, polite MDC transmissions will be inhibited when a carrier
is present on the channel.
The default is Disabled.