Zultys ZIP2x1, User Manual

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ZIP2x2 User’s Manual
7.4.4 Conference Calls
7.4.4.1 General
All calls that comprise a conference call must be encrypted or not encrypted. You cannot mix calls
on a conference call that are encrypted or not encrypted because this makes the entire conference
subject to eavesdropping and is therefore not secure.
After you have set up the call with the first person, all subsequent calls added to the conference
must be encrypted or not encrypted depending on if the first call is encrypted. You can join other
parties to the conference in the same way that you can you can join parties for a conference that
is not encrypted and as described in section 6.8.5 on page 67.
7.4.4.2 Adding Other Parties to an Encrypted Conference Call
If you have established an encrypted call, you cannot add other calls to the conference that are
not encrypted:
•
If you place the conference on hold and make a call to another person, pressing the Conf
button will have no effect and you cannot join the person to the call if that new call is not
encrypted.
•
If you press the Conf button to select a new call appearance and then you call another party
that will not support the request for encryption, your phone drops the call if it was not rejected
by the other party and shows:
The phone shows the call appearance number and the name, number, or address of the
person you were trying to call. The phone holds this display for two seconds then reverts to
the previous display.
•
If you have one or more incoming calls and you press the Conf button to join those calls to the
conference, your phone joins only those parties to the call that are encrypted. The phone
continues to alert you about the call that could not join the conference. You need to place the
conference on hold to answer the other call.
7.4.4.3 Turning Off Encryption on a Conference Call
The other parties to a conference call cannot turn off encryption on the conference call. Your
phone will reject such a request. You can turn off encryption if all the devices that are
participating in the conference have the encryption policy set to allow this.
If you try to turn off encryption and one or more devices can accept only encrypted speech, the
other device will reject the request and your phone flashes the LED on the
Encrypt button for two
seconds (250 ms on and 250 ms off). The speech will remain encrypted and thereafter the LED on
the
Encrypt button remains lit continuously.
2. Can’t encrypt
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