74
ZIP2x2 User’s Manual
The phone configures the encryption mode as normally on, normally off, always on, or never on
through the configuration file (see section C.4.2 on page 139), a menu command (see section 8.5.6
on page 117), or the web interface (see section E.6.4 on page 177).
• If the phone is configured so that encryption is always on, pressing the Encrypt button has no
effect. Your phone can make calls only to devices that also support encryption. Your phone
cannot make a call to, or receive a call from, a device that cannot encrypt the speech. You
cannot turn off encryption during a call.
• If the phone is configured so that you have control over the encryption (normally on or
normally off), your phone can communicate with devices that support or do not support
encryption. You can use the Encrypt button to engage or stop encryption. If you make a call
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 during the call.
The phone tries to establish all calls to be without encryption if configured for normally off.
You can turn on encryption 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.
ZIP2x2 and ZIP2x1 encryption is based on open standards. To encrypt the conversation, each
person use a device that supports these open standards, such as another ZIP phone or a
compatible phone.
The encryption is completely loss-less. That is, the quality of the voice for encrypted and
unencrypted calls is the same. The encryption introduces negligible delay to the speech. When
you switch between the call being encrypted or not encrypted, the phone 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 6.2 on page 46 and section 6.6 on page 64 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 6.8 on page 66.
7.4.2 Individual Calls
7.4.2.1 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 normally and the phone
lights the LED on the Encrypt button continuously green.
To Next Page
Loading...
