Media Encryption And Authentication - Polycom RealPresence 4000 Administrator's Manual

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
SRTP_SRTCP_HMAC_SHA
_LENGH Flag Value
80
32
80_32
Polycom, Inc.
Privacy Protocols - Flag Settings
Negotiation Protocol
SDP
AES_CM_128_HMAC_SHA1_80
AES_CM_128_HMAC_SHA1_32
First:
AES_CM_128_HMAC_SHA1_32
Second:
AES_CM_128_HMAC_SHA1_80
Chapter 23-Ultra Secure Mode
Authentication Tag Length
RTP RTCP
80 80
32 80
32 or 80
(Depending
on 80
negotiation
result)
23-59