Avaya 1110 Fundamentals page 332

Features
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 Avaya 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 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.
You can configure an SRTP PSK payload type ID for exchanging SRTP PSK encryption
parameters, either manually or by using automatic provisioning. You cannot manually configure
the SRTP PSK payload type ID when it is provisioned automatically. The payload type ID values
are 96, 115, and 120. The default value is 96. SRTP PSK must be enabled before you can
change the payload type ID.
SRTP PSK uses RTP packets with Payload Type ID of 96 to exchange the encryption
parameters. With UNIStim firmware Release 3.2, three Payload Type IDs can be selected to
exchange the encryption parameters: 96, 115, and 120.
The automatic provisioning feature enables you to configure SRTP automatically through a
provisioning file. For more information, see
To configure PSK SRTP on IP Phones, see the following procedures:
• 2001 IP Phone, 2002 IP Phone, 2004 IP Phone, Avaya 1110 IP Deskphone, Avaya 1210
IP Deskphone, Avaya 1220 IP Deskphone, and Avaya 1230 IP
SRTP media encryption on text-based IP Phones
• Avaya 2007 IP
Deskphone
332 IP Deskphones Fundamentals
Deskphone—Enabling SRTP media encryption on an Avaya 2007 IP
on page 333
Comments? infodev@avaya.com
Provisioning the IP Phones
on page 333
on page 443.
Deskphone—Enabling
February 2013