System information

ManualsBrandsBoots ManualsGadgetsCS-1000

371

372

373

374

375

376

377

378

379

380

Telephony features 375

USK SRTP configuration Use LD 17 to configure a system-wide Class

of Service parameter for IP Phones called Media Security System Default

(MSSD). The system default value is one of the following:

• Always Secure IP (MSAW)

• Best Effort (MSBT)

• Never (MSNV)

When you change the MSSD parameter, the system updates any IP

Phones that have a Class of Service value of MSSD to use the new MSSD

parameter.

Use LD 11 to configure the Media Security Class of Service on each IP

Phone. The IP Phone can have any of the following values:

• MSSD

•

Best Effort

• Always

•

Never

For more information about configuring system-wide Media Security and

configuring Class of Service, see Security Management Fundamentals

(NN43001-604).

PSK SRTP configuration The SRTP PSK (Pre-Shared Key) media

encryption feature provides encrypted media. A preshared secret is

embedded in the Nortel IP Phone to generate and to exchange encryption

parameters without any Call Server involvement. This feature provides

SRTP capabilities to IP Phones managed by call servers, which do not

support SRTP USK (UNIStim Key). The SRTP PSK feature must not be

used in networks where phone-to-phone one-way delay is greater than

200 ms.

The automatic provisioning feature enables you to configure SRTP

automatically through a provisioning file. For more information, see

“Provisioning the IP Phones” (page 447).

To configure PSK SRTP on IP Phones, see the following procedures:

• Phase II IP Phone 2001, Phase II IP Phone 2002, Phase II IP Phone

2004, IP Phone 1110, IP Phone 1210, IP Phone 1220, and IP Phone

Nortel Communication Server 1000

IP Phones Fundamentals

NN43001-368 05.02 26 May 2009