Polycom iPower 600 Installation Instructions Manual page 5

specified in H.235v3. Activating encryption does not affect the call
speeds that iPower systems support — encrypted calls work at all the
rates that unencrypted calls do. AES encryption is not supported for
internal multipoint calls or ISDN calls. If you acquired your system
before January 1, 2004, you must purchase a license key in order to use
the AES Encryption option. See below for more information.
People video can now be displayed at resolutions of 4CIF/4SIF. You see
crisper images with resolutions equivalent to PAL/NTSC, though frame
rates are lower.
Content video can now be displayed with H.264 compression up to XGA
resolution. In point-to-point calls between iPower systems, you can
display Content with crisp resolution more quickly and with a higher
frame rate than is possible when using H.263. This feature includes
patent-pending technology.
You can now choose to transmit VCR and Document Camera inputs as
People video. Use AdminTools to configure these sources.
AES Encryption
In IP calls that do not use the internal multipoint option, iPower supports
AES encryption as specified in H.235v3. AES encryption is not supported
for internal multipoint calls or ISDN calls.
When configured for encryption, iPower will encrypt audio, People video,
Content video and H.224 data (used for far end camera control), provided
that the far end supports this. iPower does not encrypt T.120 data or
streamed media.
iPower offers three modes for encryption:
Disabled: The system will not encrypt calls, even if the far end
supports encryption.
When Available: The system will encrypt calls if the far-end system
supports encryption; unencrypted calls will still connect successfully.
Note that integrated T.120 data sharing is disabled when you choose
this setting.
When you chose this setting, iPower will allow internal multipoint and
ISDN calls, but will first warn the user that these calls are not
encrypted. The system will also allow streaming, but it will warn the
user that the streamed media is not encrypted.
Required: The system does not complete unencrypted calls. If you
make a call and the far-end system does not support encryption, the
call does not connect. Note that integrated T.120 data sharing and
internal multipoint calls are disabled when you choose this setting.
When you chose this setting, iPower will allow ISDN calls, but will first
warn the user that these calls are not encrypted. The system will also
allow streaming but it will warn the user that the streamed media is not
encrypted.
iPower considers a call successfully encrypted if all transmit and receive
audio, video and H.224 channels are encrypted. In any of these channels