Group Call (TMO) 2-9
March 2009 Chapter 2 - MTP850 Ex/MTP810 Ex Product Information Manual 6866588D21-D
2.1.6 Receive-only Talkgroups
It is possible to provision a group to be receive-only. The group can be selected, but the terminal
does not allow the user to initiate a call to this group.
Note: Currently this is done on a per-folder basis. This approach will be changed in the future
releases.
2.1.7 Non-Selectable Talkgroups
It is possible to provision a group to be non-selectable. Such groups are not seen by the user when
scrolling through the talkgroup list, and thus the user will not be able to select the group. The user
will see the group name only upon receiving a call for the group (for instance if it is an
Announcement group associated with the selected group).
2.1.8 Audio Input and Output
Incoming group call audio is routed to the built-in speaker by default. It is also possible for the user
to cause the audio to be routed to the built-in earpiece or to an external accessory.
Outgoing group call audio is processed from the internal ‘dispatch’ microphone (located on the top
part of the unit) by default. It is possible for the user to cause the audio to be processed from an
external accessory.
2.1.9 One Touch Group Call Access
On the idle screen the user can start a group call to the currently selected talk group, using a single
PTT press.
2.1.10 Talk Time Limit
The terminal will limit the amount of time the user can continuously talk in a group call without
interruption, according to a provisioned value. The user will be warned a short time before the talk
time expires. The timer is provisioned per talkgroup folder.
2.1.11 Receiving a Group Call
In most situations, the terminal receives group calls without any user intervention.
When the terminal receives an incoming group call, the user may be alerted by a short alert tone
from the loudspeaker. This will be followed by the speech.
No user action is needed to clear the call which is cleared by the call owner (normally the SwMI).
However, the user has the ability to leave a group call (The call will continue to other users, but this
terminal will not participate).
2.1.12 Emergency Group Call
Emergency Group call is described in Paragraph 5 "Emergency Operation (TMO)".
2.1.13 Talkgroup Scanning
The user can choose a user scan list - a list of groups for the terminal to monitor. When this list is
activated, the terminal will begin to monitor traffic for these groups in addition to the traffic for the
selected group. Up to 20 user scan lists can be defined, and there can be up to 20 talkgroups in
each scan list. However, only one user scan list will be active at a time. The terminal can be
provisioned to allow the user to create and edit the scan list, or to not allow the user to do so.
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