Talking Party Identification; Call Ownership; Transmission During Group Call; Call Restoration - Motorola MTP850 S Product Information Manual

28 | Services and Features

Talking Party Identification

The PDUs and facility elements for these TETRA Supplementary Services are not supported. However, identification
presentation functionality is supported in most cases using the information found in the call setup messages.

Call Ownership

The radio can be given the call ownership of a talkgroup call. When the radio is the call owner, it sends an appropriate
TETRA signaling to end the call.
Note: The SwMI decides about the ownership of a call.

Transmission During Group Call

While receiving a group call, and the PTT during received Group Call is enabled, you may request to transmit by
pressing and holding the PTT. The system registers this action and informs you that the request has been queued.
If you release the PTT, the radio sends a message to the system withdrawing the request.

Call Restoration

If the radio roams to a new cell during a call, it attempts to continue the call on the new cell. Cell reselection and call
restoration procedures are employed for this attempt.
If the radio roams while being the transmitting party in the call, an announced cell reselection, if possible, is carried
out in the new cell.
If the radio is not the transmitting party, an unannounced cell reselection is employed, followed by call restoration
procedures.

Temporary Group Address

The radio supports the temporary group address assigned by the SwMI. The address is valid only for the lifetime of
the call.
The radio monitors signaling addressed to the temporary group, when the radio initiates a group call on the selected
group, and the SwMI assigns the call to a temporary group.
The radio supports assignment of an incoming group call to a temporary group address.

Late Entry

The user can join the group call even if not participating in it from the beginning. This is possible for example, if a
user turns on their TETRA terminal, in such a case the system diverts the user's terminal to a talkgroup call, if a call is
already in progress. Similarly, if the user's terminal has been outside of the radio coverage, for example in a tunnel,
the control channel will also divert the user's terminal to a talkgroup call assuming a call is already in progress.
Note: For TMO this feature must be configured on SwMI. Acknowledged late entry, and late entry paging
are not supported.

User Initiated Group Attachment

To enable a radio to use a group, the radio should attach the group. The radio initiates a group attachment request to
the SwMI after the RCU initialization. The attachment occurs whenever you initiate a group change and when the
radio registers on a new site. When you change the selected talkgroup, the radio initiates an attachment to the SwMI,
detaching the old group and attaching the new one.
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