Nortel 1110 Fundamentals page 449

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:
•
•
•
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:
•
•
•
•
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 200mSec.
For CS 1000 Release 4.5 or earlier, you must configure PSK SRTP on each
IP Phone. See
To configure PSK SRTP on IP Phones, see the following procedures:
•
•
Copyright © 2003–2007, Nortel Networks
.
Always Secure IP (MSAW)
Best Effort (MSBT)
Never (MSNV)
MSSD
Best Effort
Always
Never
"PSK SRTP configuration" (page
Phase II IP Phone 2001, Phase II IP Phone 2002, Phase II IP Phone
2004, and IP Phone
encryption on a Phase II IP Phone and IP Phone 1110" (page 450)
IP Phone 2007—Procedure 89 "Enabling SRTP media encryption on an
IP Phone 2007" (page 450)
Nortel Communication Server 1000
IP Phones Fundamentals
NN43001-368 02.01 Standard
Release 5.0 7 December 2007
1110—Procedure 88 "Enabling SRTP media
Media security 449
449).