AudioCodes Mediant 500L MSBR

User's Manual 336 Document #: LTRT-10466
Mediant 500L MSBR
Parameter Description
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.
Web: MKI Size
CLI: 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).
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.
Web: Reset SRTP Upon Re-key
CLI: reset-srtp-upon-re-key
[IpProfile_ResetSRTPStateUponRek
ey]
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.
Generate SRTP keys mode
CLI: generate-srtp-keys
[IpProfile_GenerateSRTPKeys]
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.
GW (Gateway Application)
Web: Coders Group ID
CLI: coders-group-id
[IpProfile_CodersGroupID]
Defines coders supported by this SIP entity, by assigning a
Coders Group.
The value, Default Coders Group represents the coders
configured in the Coders table (see Configuring Coders on
page 323
). All other optional values (e.g., Coders Group 1),
represent the coders defined for the specific Coder Group
configured in the Coder Group Settings table (see