System Feature Overview 41
68007024085 April 2011
2.3.4.5 Emergency Voice Interrupt for Emergency Voice
The Emergency Voice Interrupt feature, when enabled in a radio, is used during the initiation of an
emergency voice transmission, primarily when an interruptible voice transmission takes place on
the channel and the radio does not belong to that voice transmission.
The radio attempts to interrupt the voice transmission, and then uses the established procedures
for Emergency Voice Transmissions, when all of the following conditions are met:
• Emergency Voice Interrupt is enabled.
• The radio is in an emergency condition (e.g., the designated Emergency button was
pressed previously).
• Another radio’s interruptible voice transmission is taking place on the channel.
• The radio in the emergency condition does not belong to the other radio’s voice
transmission (i.e., the radio in the emergency condition is not receiving the other radio’s
voice transmission).
• The radio user in the emergency condition requests an Emergency Voice Transmission.
The Emergency Voice Interrupt for Emergency Voice feature is not used when the radio belongs to
the voice call is being interrupted. Instead, when the radio belongs to the call on the channel (i.e.,
the radio that is receiving the voice transmission), the “In Call Criteria” is used rather than the
Emergency Voice Interrupt feature. This is because some systems may disallow radios to interrupt
any call to which they belong. In this case, the user must wait until the receiving transmission has
finished, before beginning their Emergency Voice transmission.
The Emergency Voice Interrupt for Emergency Voice feature is also capable of interrupting an All
Call provided the All Call is transmitting interruptible voice.
NOTE: For this feature to operate consistently, all radios using the channel should be provisioned
with the ability to be interrupted. However, not all need to be provisioned with the
Emergency Voice Interrupt for Emergency Voice capability.
If the radio succeeds at interrupting the voice transmission, the radio uses the established
procedures for Emergency Voice Transmissions, once the channel has been cleared. The radio
user whose transmission was interrupted, receives a Talk Prohibit Tone until the PTT is released. If
the radio fails to interrupt the voice transmission or the voice transmission is not interruptible, the
radio also uses the established procedures for Emergency Voice Transmissions. However, the
probability of success diminishes because the original voice transmission had not been
successfully cleared from the channel.
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