System information

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374 Features

Operating parameters

The Media Security feature has the following operating parameters

•

During a firmware upgrade, the Media security is automatically

disabled.

• Media security does not support duplicate media streams encryption,

such as IP Call Recording.

•

Pre-Shared key (PSK) SRTP media encryption negotiates after the

call is setup. The first few seconds of the call can sometimes be

unsecured; after the lock icon displays the call is secure. UNIStim key

(USK) SRTP media encryption is negotiated before the call is setup

so no delays occur. In both versions of SRTP the call is secure when

the lock displays.

When USK SRTP negotiates, an outlined lock icon and Encrypted

appears on the display. When PSK SRTP negotiates, a solid lock icon

displays but Encrypted does not display.

ATTENTION

A maximum of 24 characters for a name in the Personal Directory, Callers

List, or Redial List can appear in the display area. If PSK SRTP is enabled

and the name has the maximum of 24 characters, the last character in the

name truncates to display the secure lock icon.

•

SRTP PSK does not negotiate if you use 10ms G.729, due to the

small payload size. The call remains in RTP. All other payloads are

supported for PSK SRTP. USK SRTP supports all payloads.

ATTENTION

The IP Phone 1210, IP Phone 1220, and IP Phone 1230 do not support 10ms

G.729.

Configuration

For CS 1000 Release 5.0 or later, you can configure a system-wide

configuration setting (USK SRTP), which controls whether or not the CS

1000 system is capable of providing Media Security.

It is possible to enable both PSK SRTP on the IP Phone and configure

USK SRTP at the Call Server. If USK SRTP does not negotiate for a call,

PSK SRTP attempts to negotiate during a call. If the two endpoints for the

call have PSK SRTP enabled, the call is encrypted using PSK SRTP.

By default, Media Security is enabled on the system. To configure USK

SRTP, see “USK SRTP configuration” (page 375) . To configure PSK

SRTP on the IP Phone, see “PSK SRTP configuration” (page 375) .

Nortel Communication Server 1000

IP Phones Fundamentals

NN43001-368 05.02 26 May 2009