Figure 11: Duplex Setup in FPP.
5.12.3. Receiving Duplex Calls on the SDP660
In a Full Off Air Call Set Up (FOACSU) system, the radio will start ringing and the
telephone icon will be displayed. Once the call is answered, ‘PABX’ will be displayed on
the screen along with the duplex icon indicating that simultaneous two-way
communication is activated. Calls can be answered by either pressing the PTT button
or the green connect button. see Figure 12.
Figure 12: SDP660 Receiving Duplex Call.
For Off Air Call Set Up (OACSU) systems, the radio will automatically answer any
incoming duplex calls.
5.12.4. Initiating Duplex Calls from the SDP660
To make a call from the radio, on the keypad, dial *8 followed by the extension
number, then press # or the PTT button. While the call is waiting to be answered by
the recipient, the telephone icon and ‘CALLING’ will be displayed. Once the recipient
has answered the call, the duplex icon will be displayed.
5.12.5. Disconnecting the call
Duplex calls can be terminated by either party hanging up (radio users press the red
End Call/Cancel button), or the ‘Radio to Line Timer’ expires.
In noisy environments, it is recommended that ‘PTT TX Control for Duplex Calls’
checkbox is enabled. This prevents the microphone from automatically transmitting
continuously and will allow users to PTT to enable the microphone for each
transmission. see Figure 13.
Doc Number:
TNM-U-E-0114 ISSUE 1.4
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