Notice
Nortel Page 2 of 24
are also backward compatible with Communication Server 1000 release 4.5 and earlier,
albeit without the enhancements. These firmware loads are being released with
Communication Server 1000 release 4.5 and earlier to deliver quality improvements inherent
in the new firmware that are also beneficial to the earlier releases of Communication Server
1000.
These new firmware loads, in association with Communication Server 1000 release 5.0
deliver enhancements to Nortel’s IP Telephony Solution. These enhancements provide
greater functionality. The enhancements include:
Media encryption via Secure Real-time Transport Protocol (SRTP) using UNIStim
Keys (USK)
Extended language support on selected IP Phones
More flexible network connectivity control
Additional backlight control timers on selected IP Phones
Enhancements
Media encryption via Secure Real-time Transport Protocol (SRTP) using UNIStim Keys
(USK)
Ensuring privacy of conversations in VoIP networks is becoming an increasing priority for
network administrators. Secure Real-time Transport Protocol (SRTP) [RFC 3711] is a
standards based method to encrypt RTP media. SRTP specifies a protocol to provide
confidentiality, authentication, and replay protection to RTP and RTCP traffic.
In association with Communication Server 1000 release 5.0, the 0604DBG, 0621C4J,
0623C4D, 0624C4D, 0625C4D and 0627C4D firmware loads deliver media stream
protection using SRTP.
SRTP provides a means by which two endpoints can engage in secure media exchanges.
If Media Security is enabled on the Communication Server 1000 with IP Phones running
these latest versions of firmware, the phones will use SRTP to encrypt and authenticate the
media stream. The IP Phone displays a security icon on the IP Phone’s screen to indicate
that the leg of the call from the IP Phone to the first IP termination is secure.
The security icon is an outlined padlock symbol in the first position of the first line of the
caller display.
On some phones, the message "encrypted" also appears.