Polycom IP 320 Administrator's Manual page 291

Attribute
sec.srtp.key.lifetime
sec.srtp.mki.enabled
sec.srtp.sessionParams.
noAuth.offer
sec.srtp.sessionParams.
noAuth.require
sec.srtp.sessionParams.
noEncrypRTCP.offer
Permitted
Values Default
0, positive Null
integer
minimum 1024
0 or 1 Null
0 or 1 Null
0 or 1 Null
0 or 1 Null
Interpretation
The master key lifetime used for the cryptographic
attribute in the SDP. The value specified is the
number of SRTP packets.
If set to 0 or Null, the master key lifetime is not set.
If set to 1 or greater, master key lifetime is set.
The default setting should be suitable for most
installations. When the lifetime is set greater than 0,
a re-invite with a new key will be sent when the
number of SRTP packets sent for an outgoing call
exceeds half the value of the master key lifetime.
Note: Setting this parameter to a non-zero value
may affect performance of the phone.
The master key identifier (MKI) is an optional
parameter for the cryptographic attribute in the SDP
that uniquely identifies the SRTP stream within an
SRTP session. MKI is expressed as a pair of
decimal numbers in the form: |mki:mki_length|
where mki is the MKI value and mki_length its
length in bytes.
If set to 1, a four-byte MKI parameter is sent within
the SDP message of the SIP INVITE / 200 OK.
If set to 0 or Null, the MKI parameter is not sent.
If set to 1, no authentication of RTP is offered. A
session description that includes the
UNAUTHENTICATED_SRTP session parameter is
sent when initiating a call.
If set to 0 or Null, authentication is offered.
If set to 1, no authentication of RTP is required.
A call placed to a phone configured with
noAuth.require must offer the
UNAUTHENTICATED_SRTP session parameter in
its SDP.
If sec.srtp.sessionParams.noAuth.require is
set to 1, sec.srtp.sessionParams.noAuth.offer
is logically set to 1 no matter what the value in the
configuration file.
If set to 0 or Null, authentication is required.
If set to 1, no encryption of RTCP is offered. A
session description that includes the
UNENCRYPTED_SRTCP session parameter is
sent when initiating a call.
If set to 0, or Null, encryption of RTCP is offered.
Configuration Files
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