PSTN/1i QSG V0.1E Page
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C. Placing and receiving clear (unencrypted) calls
1.
TO PLACE A CLEAR CALL:
1.1.
Put the device in clear mode.
The key must be in the horizontal position.
1.2.
Lift up the telephone receiver.
You will hear the usual dial tone.
1.3.
Dial the desired number
, just like you would on an ordinary phone.
1.4.
After the call has been established,
conduct your conversation. The clear
text conversation will not be encrypted and could be monitored and
intercepted.
1.5.
Hang up the telephone receiver when you wish to finish the call.
2.
TO RECEIVE A CLEAR CALL:
2.1.
If you expect incoming clear calls, put the device in clear mode.
The key
must be in the horizontal position. You cannot receive incoming clear calls
while the unit is in secure mode
1
.
2.2.
When the phone rings, lift up the telephone receiver.
You will hear the
calling party’s voice just like you would using a normal telephone. The clear
text conversation will not be encrypted and could be monitored and
intercepted.
2.3.
Hang up the telephone receiver when you wish to finish the call.
1
The CryptoPhone PSTN/1i was designed for use with the analog fixed-line network. In
contrast to the digital ISDN network, the analog network cannot signal whether an incoming
call is digital data or voice. As a consequence, an incoming encrypted call, which is
transported as encrypted data, cannot be recognized as such. When you pick up the
telephone receiver while in secure mode to answer an incoming call, your device will always
try to establish a data connection with the other side. If the other side is in clear mode, or not
capable of making encrypted calls at all, the other side will hear a high-pitch modem tone,
but will not be able to talk to you. For this reason, if your device shall accept incoming clear
calls, the recommended procedure is to leave the device in clear mode when not in a call. To
receive secure calls when your device is in clear mode, see section D 2.2 and section E.
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