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2 If using the front panel controls, enter the telephone number by rotating and pressing 

the Select switch. The 0-9, the 

*

, #, and P (pause) characters can be entered (# is 

displayed as a “+”). Numbers up to sixteen digits (including pauses) can be entered, 
and the number scrolls to the left in the display so that the ten right-most digits are 
always displayed. With the HHC, enter the number using the DTMF keypad (a pause 
indicated by “P” is entered by 

*

 #).

3 Press and release the PTT switch and “DIALING” is displayed. Events that may occur 

are as follows:

If the access is successful, a dial tone sounds and the dialed number is displayed and 
sent. Either ringing or a busy signal is then heard as with a standard telephone call. 
When the called party answers, press the PTT switch to talk and release it to listen 
(since the radio operates half-duplex, it is not possible to talk and listen at the same 
time).

Each time the PTT switch is released, a go-ahead tone is sent to the landside party to 
indicate when they can respond. To dial a number after the connection is made, press 
the PTT switch and dial the number using the keypad on the HHC.

Ο

If the selected telephone number is not valid, “INVALID” is displayed and an 
alert tone sounds. Select a valid number.

Ο

If the system is busy, “BUSY” is displayed and the busy tone sounds. The call 
automatically proceeds when the system becomes available.

Ο

If you are out-of-range or the radio cannot be accessed for some reason, “NO 
PHONE” is displayed and an alert tone sounds.

Ο

If the interconnect call you are making or the selected secure mode is not 
authorized, “REJECT” is displayed and an alert tone sounds.

Ο

If your radio does not have the proper encryption key, “KEYFAIL” is displayed 
and the call must be made in the clear mode by pressing the Clear/Secure option 
key (if strapped to switchable). Otherwise, load the correct key.

4 When the telephone call is finished or it could not be completed for some reason, end it 

by pressing the PHONE option switch and placing the microphone back on-hook.

To receive a telephone call:

1 When a telephone call is received, “ringing” similar to a standard telephone is heard 

and “PHONE” is displayed.

2 To answer the call, press the PHONE option switch and press the PTT switch to talk 

and release it to listen (since the radio operates half duplex, it is not possible to talk and 
listen at the same time).

3 When the call is finished, end it by pressing the PHONE option switch and placing the 

microphone back on-hook.