Version 7.2
407
Mediant 500 MSBR
User's Manual
23. Coders and Profiles
Parameter
Description
EnableMediaSecurity is set to 0), it responds with RTP.
If two 'm=' lines are received in the SDP offer, the device
prefers the SAVP (secure audio video profile), regardless
of the order in the SDP.
Note:
The parameter is applicable only when the
EnableMediaSecurity parameter is set to 1.
The corresponding global parameter is
MediaSecurityBehaviour.
Symmetric MKI
enable-symmetric-mki
[IpProfile_EnableSymmetricMKI]
Enables symmetric MKI negotiation.
[0] Disable = (Default) The device includes the MKI in its SIP
200 OK response according to the SRTPTxPacketMKISize
parameter (if set to 0, it is not included; if set to any other
value, it is included with this value).
[1] Enable = The answer crypto line contains (or excludes) an
MKI value according to the selected crypto line in the offer.
For example, assume that the device receives an INVITE
containing the following two crypto lines in SDP:
a=crypto:2 AES_CM_128_HMAC_SHA1_80
inline:TAaxNnQt8/qLQMnDuG4vxYfWl6K7eBK/ufk04pR
4|2^31|1:1
a=crypto:3 AES_CM_128_HMAC_SHA1_80
inline:bnuYZnMxSfUiGitviWJZmzr7OF3AiRO0l5Vnh0k
H|2^31
The first crypto line includes the MKI parameter "1:1". In the
200 OK response, the device selects one of the crypto lines
(i.e., '2' or '3'). Typically, it selects the first line that supports
the crypto suite. However, for SRTP-to-SRTP in SBC
sessions, it can be determined by the remote side on the
outgoing leg. If the device selects crypto line '2', it includes
the MKI parameter in its answer SDP, for example:
a=crypto:2 AES_CM_128_HMAC_SHA1_80
inline:R1VyA1xV/qwBjkEklu4kSJyl3wCtYeZLq1/QFux
w|2^31|1:1
If the device selects a crypto line that does not contain the
MKI parameter, then the MKI parameter is not included in the
crypto line in the SDP answer (even if the
SRTPTxPacketMKISize parameter is set to any value other
than 0).
Note:
The corresponding global parameter is
EnableSymmetricMKI.
MKI Size
mki-size
[IpProfile_MKISize]
Defines the size (in bytes) of the Master Key Identifier (MKI) in
SRTP Tx packets.
The valid value is 0 to 4. The default is 0 (i.e., new keys are
generated without MKI).
Note:
Gateway application: The device only initiates the MKI size.
SBC application: The device can forward MKI size as is for
SRTP-to-SRTP flows or override the MKI size during
negotiation. This can be done on the inbound or outbound
leg.
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