Motorola HT 1000 User Manual page 135

DTMF Hot Keypad This feature is limited to VISAR radios with firmware version 2.06 and later.
If this field is enabled on a radio having an earlier version firmware, it will
have no effect.
Use the UP/DOWN arrow keys to enable/disable this feature. When
this feature is enabled, DTMF Digit transmission will be allowed
without the use of a radio side button dedicated to the Phone
function. When this field is enabled, the user only needs to press and
hold the PTT button, and then press the desired keys on the keypad to
transmit the corresponding DTMF digits.
Some of the features of the dedicated Phone mode will not be available when
this method is used, however. Automatic transmission of access/de-access
codes will not be possible, and the VISAR display will not show PH to
indicate the dedicated Phone mode.
The default is Disabled.
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