Motorola solutions MTP3550 - Call Modification; Local Site Trunking; Entering Local Site Trunking

3.1.9
Call Modification
Call Modification is a feature that allows your service provider to modify the call to optimize it and
adjust to a current situation.
Modification can cover:
Call priority
Modified during call setup.
Call type
Modified during call setup.
Call encryption
Modified during an ongoing call, but not in the transmission phase.
When the call is modified, your radio displays Call Modified message.
When a recently modified call requires the PTT button to transmit, your radio displays Call
Modified Use PTT.
All modifications are made by your service provider and your radio only follows them. You have no
influence on ongoing call modifications.
When call priority is changed to emergency:
• The display indicates that an Emergency Group Call has been received.
• Your radio plays a special audio alert.
NOTE: If a Group Call is modified into an Emergency Group Call, no emergency-related
features are triggered.
If your radio cannot follow a call modification requested by the service provider, due to its settings, your
radio rejects it and displays Service Not Available message.
3.2
Local Site Trunking
This mode is also called as Fallback Mode and it allows more than one radio from the same site
to communicate when the link between the site and the network central controller fails. Entering and
exiting Local Site Trunking (that is, returning to System Wide Services) is done automatically. In this
mode, some services are unavailable.
NOTE: Your service provider can disable this mode.
3.2.1
Entering Local Site Trunking
When your radio receives a Local Site Trunking indication from the system, the following occurs:
• Your radio sounds an Entering Local Site Trunking tone.
• Display shows the Local Area Service message.
NOTE: Noticeable only on the color display.
• Any call in progress is dropped upon entering Local Site Trunking Mode.
If configured by your service provider, this message/alert is periodically repeated to remind you that
your radio is still operating in Local Site Trunking Mode. The following features are available:
• Registration
MN001489A01-BR
Chapter 3 : Modes
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