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MN004527A01-AG
Chapter 2: Services and Features
same gateway as phone calls, that is, PSTN gateway configured in the codeplug. If an MSISDN call is
placed, two radios can have a simplex or duplex call based on the assigned ISDN number.
NOTICE: The Dimetra Infrastructure does not support private calls and Short Data Service
(SDS) through MSISDN.
2.11.2
Phone Call Reception
Incoming phone calls, from the land gateway to mobile, use on-off hook signaling. The radio extracts
the gateway ID from the call setup signaling, to determine whether to start phone or Private Automatic
Branch Exchange (PABX) call.
2.11.3
Call Restoration in Phone Call
If the radio roams while being in an active phone call, and the announced cell reselection is possible,
then the announced cell reselection is employed. Also the call restoration procedures are performed.
2.12
Emergency Operations
Emergency Operations are used in critical situations.
Pressing the Emergency button and pressing the Send key, activates one or more services,
depending on the service provider setting.
NOTICE: It is possible to power up the radio by pressing the Emergency Button. Depending on
the service provider settings, the radio can start Emergency Operations automatically. If the
radio is PIN-protected, except for SIM PIN, Emergency Operations bypass the PIN lock during
the Emergency Operations.
During Emergency Operations, the radio automatically rejects phone, Private Automatic Branch
Exchange (PABX), and private calls, and does not monitor the talkgroups in the selected scan list.
However, if an Announcement Talkgroup (ATG) is the selected group, the radio monitors the sub-
groups associated with the ATG.
When entering Emergency Operation, any ongoing voice call is aborted or cleared down. Any packet
data transfer in progress is aborted. However, the session is kept open.
2.12.1
Emergency Group Call
The Emergency Group Call has the highest communication priority, which makes it a pre-emptive call.
Emergency Group Call is available in both Trunked Mode Operation (TMO) and Direct Mode Operation
(DMO) modes.
During Emergency Operations, Emergency Group Call can be started by pressing PTT. The radio may
also support Hot Microphone operation, which allows the Emergency Call to be conducted without
pressing PTT. If a radio receives an incoming group call with emergency priority, the display shows
that an emergency call has been received, and a special audio alert is played.
The Emergency Group Call Termination feature allows the radio user to attempt terminating an
Emergency Group Call by pressing the Back touch icon. The ownership status of the radio determines
the following termination conditions:
Call Owner
The radio sends a disconnection PDU to the SwMI. The SwMI responds by sending a release PDU
response with an indication that the call has been disconnected.
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