Zultys ZIP4x4, User Manual

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ZIP4x4 User’s Manual
to a device that does not support encryption, and you have requested that the call be
encrypted or your phone by default is trying to engage encryption, the call will complete with
encryption disabled. You can engage and stop encryption during a call.
The phone tries to establish all calls to be encrypted if configured for
normally on . You can
turn off encryption before or during the call.
The phone tries to establish all calls to be without encryption if configured for
normally off .
You can turn on encryption before or during the call.
•
If the phone is configured so that encryption is never on (cannot be engaged), pressing the
Encrypt button has no effect. Your phone can make calls only to devices that are do not require
encryption. Your phone cannot make a call to, or receive a call from, a device that always
encrypts the speech. During a call, your phone will reject a request by the far end to engage
encryption.
Regardless of the setting chosen by the administrator, the LED on the Encrypt button is off when
the phone is idle. It becomes active only during a call as described in the sections below.
ZIP4x4 encryption is based on open standards. To encrypt the conversation, each person must be
using a device that supports these open standards, such as another ZIP4x4 or compatible phone.
The encryption is completely loss-less. That is, the quality of the voice is the same whether the
voice is encrypted or not. The encryption introduces negligible delay to the speech. When you
switch between the call being encrypted or not encrypted, the ZIP4x4 performs this almost
instantaneously, but can take as long as 200 ms if there is a lot of traffic on the network.
Ensure that you understand the various ways to originate and terminate a call as described in
section 8.2 on page 72 and section 8.6 on page 94 before reading the remainder of this section. If
you want to create a conference call with encryption, ensure you know how to use the conference
functions as described in section 8.8 on page 99.
7.2.2 Individual Calls
7.2.2.1 Making a Call When Encryption is Always On
Whenever you select a call appearance (directly or indirectly) to make a call, the LED on the
Encrypt button flashes green synchronously with the green LED on the call appearance button.
If the device that you are calling supports encryption, the call completes as normal and the ZIP4x4
lights the LED on the Encrypt button continuously green.
If the device that you are calling cannot support encryption, the call will not complete. Your
ZIP4x4 plays the fast busy tone (congestion tone) and flashes the LED on the call appearance
button and the Encrypt button green and red for 250 ms each color. The display changes to:
The phone shows the call appearance number and the name, number, or address of the person
you were trying to call.
The phone maintains this state until you go on hook.
1. Encrypt Rejected
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