Dmo Individual Call Presence Check; Dmo Individual Only Talkgroups; Dmo Private Priority Call; Phone Call - Motorola MTP850 S Product Information Manual

Assistance Call can be a simplex or duplex call depending upon your service provider settings. An Assistance Call is
full-duplex when you start the call using radio menu. When you type the number and press PTT, then your radio starts
a half-duplex call, but if you type the number and press SEND, then the call is duplex.

DMO Individual Call Presence Check

If the other party is listening, the Presence Check feature allows the user making a DMO private call to have a
confirmation. This is important in situations where it is crucial that the message gets through. A radio with Presence
Check enabled displays the "Party not available" message if the other party does not answer. To use this feature, both
radios need to support it.
In addition, radios can be configured to Accept DMO Individual Calls with Presence Check. If enabled, the radio
accepts incoming calls with or without the presence check. If disabled, the radio only accepts private calls without the
presence check.

DMO Individual Only Talkgroups

It is possible to configure some or all DMO talkgroups to allow only individual calls. This helps optimize frequency
allocation in Direct Mode Operation.

DMO Private Priority Call

The service provider may assign Pre-emptive Priority to outgoing DMO Private Calls. If this is the case, DMO
Private Calls from this radio preempt any ongoing calls (with the exception of emergency calls or ongoing Pre-
emptive Priority Private Calls) on the receiving radio, which then displays Call-preempted.

Phone Call

The phone call service enables a radio in TMO to communicate in a one-on-one simplex or duplex conversation with
a phone (for example, a phone calls-enabled TETRA radio or landline number) using a telephone switch. The radio
supports individual call service to an external identity.
Two phone call types are available:
• PSTN (a full phone number) is addressed to the defined PSTN gateway address.
• PABX phone number, for internal calls, numbers dialed are addressed to the defined PABX gateway address.
Note: The PSTN phone call is supported when PSTN/PABX feature is enabled in the codeplug and the
SwMI supports this functionality. The PSTN/PABX gateway must be configured properly.
No more than one PSTN/PABX gateway ID and one PABX/PABX gateway ID are available in the radio.

Phone Call Initiation

The radio is able to initiate phone calls to a PSTN/PABX with duplex speech capability. This call type uses TETRA
individual call signaling using single stage dialing and hook setup for outgoing calls.
Using the hook signaling for phone calls, implies that until a traffic channel is allocated, the radio generates all
feedback tones internally. In addition, the radio accepts SwMI modification of the call setup to direct, enabling the
infrastructure to generate the progress tones.
Phone calls can also be made between TETRA radios using the MS-ISDN number as the called party number. MS-
ISDN calls share the same gateway as phone calls, that is, PSTN gateway configured in the codeplug. If an MS-ISDN
call is placed, two radios can have a simplex or duplex call based on assigned ISDN number.
Note: The Dimetra Infrastructure does not support private calls and SDS through MS-ISDN.
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