AudioCodes Mediant 800B User Manual page 309

User's Manual
Parameter
Web: MKI Size
CLI: mki-size
[IpProfile_MKISize]
Web: Reset SRTP Upon Re-key
CLI: reset-srtp-upon-re-key
[IpProfile_ResetSRTPStateUp
onRekey]
Generate SRTP keys mode
CLI: generate-srtp-keys
[IpProfile_GenerateSRTPKeys
]
Jitter Buffer Max Delay
CLI: jitter-buffer-max-delay
[IpProfile_JitterBufMaxDelay]
GW
Web: Coders Group ID
CLI: coders-group-id
Version 6.8
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/QFuxw
|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.
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).
Notes:

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.

The corresponding global parameter is SRTPTxPacketMKISize.
Enables synchronization of the SRTP state between the device and
a server when a new SRTP key is generated upon a SIP session
expire. This feature ensures that the roll-over counter (ROC), one
of the parameters used in the SRTP encryption/decryption process
of the SRTP packets, is synchronized on both sides for transmit
and receive packets.

[0] Disable = (Default) ROC is not reset on the device side.

[1] Enable = If the session expires causing a session refresh
through a re-INVITE, the device or server generates a new key
and the device resets the ROC index (and other SRTP fields) as
done by the server, resulting in a synchronized SRTP.
Notes:

If this feature is disabled and the server resets the ROC upon a
re-key generation, one-way voice may occur.

The corresponding global parameter is
ResetSRTPStateUponRekey.
Enables the device to generate a new SRTP key upon receipt of a
re-INVITE with this SIP entity.

[0] Only If Required= (Default) The device generates an SRTP
key only if necessary.

[1] Always = The device always generates a new SRTP key.
Defines the maximum delay and length (in msec) of the Jitter
Buffer.
The valid range is 150 to 2,000. The default is 250.
Defines coders supported by this SIP entity, by assigning a Coders
Group.
309
19. Coders and Profiles
Description
Mediant 800B Gateway and E-SBC