Phone Call Reception; Call Restoration In Phone Call; Emergency Operations; Emergency Group Call - Motorola MTP850 S Product Information Manual

32 | Services and Features

Phone Call Reception

Incoming phone calls (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 PABX call. That means you need to answer the call e.g. by
pressing the SEND button.

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.

Emergency Operations

Emergency Operations are used in critical situations.
Pressing the EMERGENCY button or entering Emergency number and pressing the SEND key, activates one or more
services (depends on the service provider setting):
• Sending Emergency Alarm
• Sending SDS Status
• Starting Silent Emergency
• Starting Hot Microphone operation
• Starting Emergency Individual Call (Private or MS-ISDN)
Note: 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 was PIN-protected
(except SIM PIN), Emergency Operations will bypass the PIN lock for the duration of the Emergency
Operations.
During Emergency Operations, the radio automatically rejects phone, PABX and private calls, and does not monitor
the talkgroups in the selected scan list. However, if an 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.

Emergency Group Call

The Emergency Group Call has the highest communication priority that means it is the pre-emptive call. Emergency
Group Call is available in both TMO and DMO modes. During Emergency Operations, Emergency Group Call can be
started by pressing PTT. The MS 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.
An emergency group call can be configured as non-tactical or tactical:
• A non-tactical call is initiated on a talkgroup designated by the codeplug setting. When in non-tactical emergency
mode, you cannot switch talkgroups.
• A tactical call is initiated on the currently selected talkgroup
In TMO, if the radio enters emergency operations while the emergency broadcast call is active the radio continues on
the call without initiating any calls and sends an emergency alarm.
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