2-20 Services and Feature Description
6866537D87-F Chapter 2 - MTM800 Product Information Manual September 2008
Repeater and Gateway are not supported. When a DMO Private Call takes place, terminals not
involved in this call receive the channel busy indication.
Current implementation does not support the presence check. This implies that the calling party
does not know if the called party is available when the call is originating.
The Terminals are identified by Short Subscriber Identities. DMO Private Call is a half-duplex call.
6.4 DMO Emergency
The terminal supports initiation and acceptance of DMO Emergency group calls, this includes
support of call preemption. Emergency calls via gateway will also be supported. If Emergency Call
is provisioned in the terminal, upon pressing the Emergency key/button in DMO, the terminal will go
into Emergency Mode and allow the user to initiate an emergency call.
6.4.1 DMO Emergency Alarm
If the terminal is provisioned with the emergency alarm feature, upon entry into emergency mode,
the terminal sends an emergency alarm. This alarm is sent by sending a specially designated SDS
status message to the address of the selected group. The alarm status is received by all the radios
attached to the same talkgroup.
6.5 DMO Inter-MNI Calls
Terminals support receipt of DMO group calls addressed to the ‘Open MNI’ (MNI and SSI all 1s),
and those addressed to the Open Group (SSI is all 1s) with the home MNI or the MNI of the
currently selected group.
Terminals can have a list of partnership DMO (Gateway) networks and if a call is received to the
selected group and an MNI that is in the partnership list, a terminal will join the call if the selected
group has been programmed to enable partnership.
The terminals also support call set up of a DMO group call to any provisioned GTSI and the MNI
does not have to be in the partnership list.
6.6 DMO Gateway/Repeater
The terminal provides the capability of communicating in DMO mode with a TMO group via the
Cleartone TETRA DMO gateway as defined in [Ref 24].
A DMO repeater re-transmits information received from one DM-MS to other DM-MS(s) over the
DMO air interface.
The terminal allows the user to operate for each DMO talkgroup in one of 6 modes. The user can
choose which mode to operate in:
• DM-MS to DM-MS only: In this mode, the terminal will only initiate calls on this talkgroup
directly - not via a gateway or repeater.
• Specific gateway: In this mode, the terminal can initiate calls on this group directly DM-MS
to DM-MS or via a specific gateway address that is specified for this specific talkgroup. This
gateway address will be editable by the user.
• Automatic gateway: In this mode, the terminal can initiate calls on the selected group
directly with another terminal or via any usable gateway that is detected as present.
• Repeater: In this mode, the talkgroup should link to a repeater and by that to enhanced it’s
coverage area.
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