Polycom RealPresence 2000, Administrator'S Manual

Page: 841 / 1130

Chapter 23-Ultra Secure Mode
Polycom, Inc.
23-59
Self-signed Certificates are indicated in the Certification Repository - Issued By field.
Media Encryption and Authentication
In compliance with UC_APL_SEC_0013, the RMX supports Privacy Protocol
AES_CM_128_HMAC_SHA1_32, in addition to AES_CM_128_HMAC_SHA1_80.
System Flag
The Privacy Protocol selection is controlled by the SRTP_SRTCP_HMAC_SHA_LENGH
System Flag. To modify its setting, manually add it to system.cfg and set its value as
summarized in Table 23-19.
Range: 80, 32, 80_32
Default: 80
Table 23-19 Privacy Protocols - Flag Settings
SRTP_SRTCP_HMAC_SHA
_LENGH Flag Value Negotiation Protocol
SDP
Authentication Tag Length
RTP RTCP
80 AES_CM_128_HMAC_SHA1_80 80 80
32 AES_CM_128_HMAC_SHA1_32 32 80
80_32 First:
AES_CM_128_HMAC_SHA1_32
Second
:
AES_CM_128_HMAC_SHA1_80
32 or 80
(Depending
on
negotiation
result)
80