AudioCodes Mediant 4000 SBC, User Manual

Page: 567 / 1037

CHAPTER 24 Configuring Call Admission Control
Mediant 4000 SBC | User's Manual
Parameter Description
'Maximum Burst Per User'
max-burst-per-user
[SBCAdmissionRule_
MaxBurstPerUser]
Defines the maximum number of tokens (SIP dialogs) per
user that the bucket can hold (see the 'Maximum Burst'
parameter for a detailed description).
The default is 0 (i.e., unlimited SIP dialogs).
Note: The parameter functions together with the 'Rate Per
User' parameter (see above).
'Reserved Capacity'
reservation
[SBCAdmissionRule_
Reservation]
Defines the guaranteed (minimum) call capacity.
The default is 0 (i.e., no reserved capacity).
If you configure reserved call capacity for an SRD and each
of its associated IP Groups, the SRD's reserved call
capacity must be greater or equal to the summation of the
reserved call capacity of all these IP Groups. In other
words, the SRD serves as the "parent" reserved call
capacity. If the SRD's reserved call capacity is greater, the
extra call capacity can be used as a shared pool between
the IP Groups for unreserved calls when they exceed their
reserved capacity. For example, assume that the reserved
capacity for an SRD and its associated IP Groups are as
follows:
■ SRD reserved call capacity: 40
■ IP Group ID 1 reserved call capacity: 10
■ IP Group ID 2 reserved call capacity: 20
In this setup, the SRD offers a shared pool for unreserved
call capacity of 10 [i.e., 40 – (10 + 20)]. If IP Group ID 1
needs to handle 15 calls, it is guaranteed 10 calls and the
remaining 5 is provided from the SRD's shared pool. If the
SDR's shared pool is currently empty and resources for new
calls are required, the quota is taken from the device's total
capacity, if available. For example, if IP Group ID 1 needs to
handle 21 calls, it's guaranteed 10, the SRD's shared pool
provides another 10, and the last call is provided from the
device's total call capacity support (e.g., of 200).
Note:
■ Reserved call capacity is applicable only to IP Groups
and SRDs.
■ Reserved call capacity is applicable only to INVITE and
SUBSCRIBE messages.
■ Reserved call capacity must be less than the maximum
capacity (limit) configured for the CAC rule (see the
'Limit' parameter).
■ The total reserved call capacity configured for all CAC
rules must be within the device's total call capacity
support.
- 534 -