In all the cases, the talkgroup is removed from all the scan lists as no matter if they are active or inactive.
If the de-assignment is for the selected group, depending on the service provider settings, the radio;
• notifies that there is no group attached (when in the group mode), and does not attach to another talkgroup
automatically.
• attaches to the previously selected talkgroup (talkgroup it was attached to before the DGNA being assigned). If the
previous selected group is not present then the radio shows that there is no group attached and displays "No
Group".
• attaches to a default talkgroup configured by the service provider. If the default talkgroup is unavailable (it was
deleted), the radio enters the “No Group” state.
At each talkgroup change, an appropriate notification is shown on the display.
If the de-assignment is for an announcement group, the talkgroup is removed from the talkgroup list. Additionally, all
the groups that are associated with this announcement group do not have an associated announcement group. If the
currently selected talkgroup is associated with this announcement group, the radio stops scanning the associated
announcement group.
When the DGNA operation is successful, if the radio is provisioned for DGNA user notification, you are notified
about the operation. For example group added, group deleted. The notification is displayed until you confirm the
operation. In case you receive a call, the message continues displaying until you confirm it.
On viewing an assigned talkgroup notification, the radio provides the ability for the user to make that group to be a
selected group.
The radio supports the reception of a DGNA Assignment that is addressed to its selected talkgroup as a supergroup of
the selected group. All signaling addressed to the supergroup is monitored in addition to signaling addressed to the
selected group, any announcement or associated groups, and groups in the active scan lists.
When the selected group is unselected, the radio ceases processing signaling to the supergroup that was associated
with that selected group.
The radio receives the lifetime of the supergroup as part of the assignment signaling. If a subsequent assignment to
the same group is not received within that lifetime, the radio ceases monitoring that supergroup.
The radio also supports supergroups of scanned groups, such that a group addressed DGNA assignment received on
one of the user scan group addresses causes the radio to monitor all signaling addressed to that supergroup as long as
the scan group is being monitored, and as long as the supergroup lifetime lasts.
The following DGNA functionalities are not supported:
• Call-related DGNA.
• Functionality of the authorized user.
• Network authentication before accepting DGNA.
Ambience Listening
The Ambience Listening (AL) feature allows a console operator or dispatcher to monitor audio activity in the vicinity
of a specific radio without giving any indication to the affected radio.
When the radio receives a call setup message with an AL call, the radio accepts the call. Then the radio opens the
microphone, and begins transmitting without showing any indication of the call. Call acceptance and rejection while
active in another call follows the PPC rules.
The radio imposes no time limit on the transmission. The radio continues to transmit until the SwMI ends the call or
the user performs an action that releases the call. If the user attempts to start a service while the AL call is in progress,
the radio disconnects the call and initiates the requested service. The radio allows performing actions that can be
performed without releasing the AL call. These actions include access of most menu items, activating, deactivating
scan lists, and changing talkgroups. When changing talkgroups, the radio appears as if it is performing an attachment.
The attachment appears to be successful, but the actual attachment signaling is performed only after the AL call
terminates. When performing the attachment after the call, no indication is shown to the user unless the attachment
Services and Features | 59
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