AudioCodes Mediant 4000 SBC, User Manual

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CHAPTER 24 Configuring Call Admission Control
Mediant 4000 SBC | User's Manual
Parameter Description
[SBCAdmissionRule_
LimitPerUser] You can also use the following special values:
■ [-1] -1 = (Default) Unlimited.
■ [0] 0 = Block all the SIP dialog types specified in the
'Request Type' parameter (above).
'Rate'
rate
[SBCAdmissionRule_Rate]
Defines the number of tokens added to the token "bucket"
per second, where a token "buys" a SIP dialog.
For example, if you configure the parameter to 1, one token
is added to the bucket every second. If there are no calls for
five seconds, the bucket would have accumulated 5
tokens.
The default is 0 (i.e., unlimited rate).
Note: If you configure this parameter, you must also
configure the 'Maximum Burst' parameter to a non-zero
value.
'Maximum Burst'
max-burst
[SBCAdmissionRule_
MaxBurst]
Defines the maximum number of SIP dialogs that can be
processed at any given time. In other words, it defines the
maximum number of tokens that can the "bucket" can hold.
The device only accepts a SIP dialog if a token exists in the
"bucket". Once the SIP dialog is accepted, a token is
removed from the "bucket".
If a SIP dialog is received by the device and the token
"bucket" is empty, the device rejects the SIP dialog.
Alternatively, if the "bucket" is full, for example, 100
tokens, and 101 SIP dialogs arrive (before another token is
added to the "bucket", i.e., faster than that configured in the
'Rate' parameter), the device accepts the first 100 SIP
dialogs and rejects the last one.
The device sends a SIP 480 “Temporarily Unavailable”
response when it rejects requests. Dropped requests are
not counted in the "bucket".
The default is 0 (i.e., unlimited SIP dialogs).
Note:
■ The parameter functions together with the 'Rate'
parameter (see above).
■ The parameter's value cannot be greater than 10 times
(x) the value of the 'Rate' parameter. For example, if
you configured the 'Rate' parameter to 2, you can
configure the 'Maximum Burst' parameter to any value
less than or equal to 20 (i.e., 10 x 2).
■ The token bucket feature is per SIP request type and
SIP request direction.
'Rate Per User'
rate-per-user
[SBCAdmissionRule_
RatePerUser]
Defines the maximum allowed number of concurrent SIP
dialogs per registered user that can be handled per second.
The default is 0 (i.e., unlimited rate).
Note: If you configure this parameter, you must also
configure the 'Maximum Burst per User' parameter to a non-
zero value (see below).
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