AudioCodes Mediant 2600 - Page 302

User's Manual 302 Document #: LTRT-42060
Mediant 2600 E-SBC
Parameter Description
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:
 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_ResetSRTPStateUp
onRekey]
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.
Jitter Buffer Max Delay
CLI: jitter-buffer-max-delay
[IpProfile_JitterBufMaxDelay]
Defines the maximum delay and length (in msec) of the Jitter
Buffer.
The valid range is 150 to 2,000. The default is 250.
SBC
Web: Extension Coders Group
ID
CLI: sbc-ext-coders-group-id
[IpProfile_SBCExtensionCoders
GroupID]
Assigns a Coder Group ID used for Extended (additional) coders,
added to the outgoing leg for this SIP entity. This is used when
transcoding is required between two IP entities (i.e., the SDP
answer from one doesn’t include any coder included in the offer
previously sent by the other). Therefore, to allow IP entities to
communicate with each other regardless of their capabilities, an
Extended coders table with at least one coder that is supported by
each IP entity needs to be assigned to each IP Group. Therefore,
each offer destined to specific IP Groups includes this coder.
Note: To configure Coders Groups, see Configuring Coder Groups
on page 296.