Motorola MTM800 Product Information Manual

Group Call (TMO) 2-11
September 2008
Chapter 2 - MTM800 Product Information Manual 6866537D87-F
• All associated groups are also monitored (‘scanned’)
• Normal TG scan list is disabled
• When group associated with ATG is selected
• ATG also monitored (‘scanned’)
• Normal TG scan list remains active
2.2.5 Temporary Group Address
When a terminal initiates a group call, the system may assign the call to a temporary group, for the
call duration only, and terminals will monitor all signalling addressed to this temporary group.
Similarly terminals support assignment of an incoming call to a temporary group address.
The terminal can support a temporary group address assigned by the SwMI which is only valid for
the lifetime of the call. Thus, if the terminal initiates a group call on the selected group, and the SwMI
assigns the call to a temporary group, the terminal can monitor all signalling addressed to this
temporary group as long as the call is active.
The terminal can support assignment of an incoming group call to a temporary group address.
2.2.6 Group Attachment
Whenever a user selects a new Talkgroup the terminal sends an ‘amendment’ attachment message
to the system. This tells the system what Talkgroup the terminal is now actively monitoring and
should now receive all call setup procedures for this group.
If a scan list has been selected and Talkgroup scanning is enabled by user action, this message will
be sent for all Talkgroups in the active scan list.
2.2.7 Late Entry
Terminals may miss the initial group call setup for various reasons and the system, by repeatedly
sending the group call set up as a ‘Late entry Broadcast’ on the control channel for the call duration,
enables the terminals to join the call at a later time.
The terminal will join a group call setup which contains a notification element indicating Late Entry
Broadcast. During Tx (Not hang time) SwMI sends periodic D-SETUPs on MCCH. However, it will
not differentiate between this and a regular call setup in any way.
Benefits:
❏ When used was out of range or just has finished another call then the terminal does not miss
an ongoing call of the selected Talk Group
2.2.8 Call Ownership
The terminal accepts call ownership of a group call. When the terminal is the call owner it will send
U-DISCONNECT when leaving the call.
2.2.9 Transmit Request Queueing
Whilst another user is talking during an ongoing group call and “PTT during received Group Call”
codeplug is enabled, a user may request to transmit by pressing and holding the PTT button. The
system will see this action and inform the user that the request has been queued.
While the MS is in Emergency Mode the transmission request is not ignored and the queuing is
ignored.

Motorola MTM800 Specifications

General

Brand	Motorola
Model	MTM800
Category	Handhelds
Language	English