4. DSC GENERAL MESSAGE CALLING, RECEIVING
4-10
4.3.2 How to receive a PSTN call
When a PSTN call is received, the icon appears in the tab area. An able/unable
acknowledge is sent automatically according to the setting of [PSTN] on the [ACK
SETTINGS].
• [AUTO (ABLE)]: The automatic able acknowledge (which means you can commu-
nicate with party) is sent.
• [AUTO (UNABLE)]: The automatic unable acknowledge (which means you cannot
communicate with party) is sent.
Able acknowledgement
The automatic able acknowledge is sent and the pop-up message "PSTN connected
pick up HANDSET!" appears.
Note: If you have already picked up the handset before the pop-up message appears,
a pop-up message which suggests you to push the CHANNEL/ENTER knob appears.
Push the CHANNEL/ENTER knob to accept.
1. Pick up the handset. When you receive the PSTN ACK message, the screen for
telephone calling appears. Communicate with the party. The elapsed time since
starting communication is displayed.
2. To quit the communication, do one of the following.
• On hook the handset. END OF CALL is sent automatically. The waiting ACK for
END OF CALL screen appears. When you receive the ACK, rotate the CHAN-
NEL/ENTER knob to select [QUIT] then push the knob.
Note: Be sure to on hook the handset to quit the communication so as not to
incur further charges.
• When the PSTN line is disconnected by the coast station, you receive the END
OF CALL ACK message. Rotate the CHANNEL/ENTER knob to select [QUIT]
then push the knob.
After disconnection of the PSTN line, the END OF CALL ACK is sent.
Unable acknowledgement
The automatic unable acknowledge is sent. The audio alarm sounds and the LED
flashes in green. Press the CANCEL key.
4.3.3 Caution for a PSTN call
After you send a PSTN call and receive an ACK (regardless of on hook or off hook
condition), the following pop-up message appears.
If you do not push the CHANNEL/ENTER knob or pick up the handset within 60 sec-
onds, the PSTN call is disconnected because of timeout.
On hook
Off hook
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