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Comment: Common note added for SBX-97718 Subscribe CAC limitation.


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In this section:

Table of Contents



Use this feature to define multi-level Call Admission Control (CAC) policy using IP hierarchal trunks. A hierarchy is created by linking trunks together in a pyramid-type structure. Regular IP trunks are at the base of the pyramid; above them in the pyramid are IP linked trunks or shared CAC-limits pools.

A shared CAC-limits pool is a global resource that constrains the resource usage of a set of trunks. Both the limit and current usage is maintained for each value. A shared CAC-limits pool is not tied to a specific zone or address context. There may be up to 2,000 shared CAC limits pools on

Spacevars
0product
.

Validation rules:

  • There can only be one parent for any object.
  • An IP trunk group can be assigned as child to any CAC-limits pool (parent).
  • A CAC-limits pool can be assigned as a parent to any other CAC-limits pool that does not have a parent of its own.
  • A CAC-limits pool cannot be assigned to a parent if it already has a CAC-limits pool child.
  • The children of a particular CAC-limits pool can be either CAC-limits pools or IP trunks.

Call processing rules when using shared CAC-limits pool involve:

  • Applying the configured limits.
  • Checking the limits of the parent above in the pyramid. If limits are met by all parents, the call is admitted.

The hierarchy has a maximum of three levels: two levels of shared CAC-limits pool and an IP trunk at the bottom. The hierarchy is built bottom up by assigning a parent to an existing trunk group or CAC-limits pool. The parents must exist before being assigned.

Note
When deleting a parent and associated child CAC, be sure to first de-associate the child from the parent before deleting the parent CAC. Do not attempt to delete both in the same transaction. See examples below:


Deletion Scenario 1:

Code Block
languagenone
% delete addressContext AC1 zone ZONE_IAD sipTrunkGroup TG1 parentSharedCacLimitsPoolName 
% commit 
% delete global cac sharedCacLimitsPool CAC0 
% commit

Deletion Scenario 2:

Code Block
languagenone
% delete global cac sharedCacLimitsPool CAC0 parentSharedCacLimitsPoolName 
% commit 
% delete global cac sharedCAcLimitsPool CAC1 
% commit

Include Page
Param_values_exception
Param_values_exception

Include Page
_Subscribe_CAC_Access_Restriction
_Subscribe_CAC_Access_Restriction

Command Syntax

Use the following CLI syntax to configure global CAC policy:

Code Block
languagenone
% set global cac sharedCacLimitsPool <pool_name>
	bandwidthLimit <0-2000000000, unlimited>
	bandwidthLimitThreshold <0-100>
    bandwidthVideoThreshold <0-100>
	callLimit <0-2000000000, unlimited>
	callLimitThreshold <0-100>
	egress
		callBurstMax <1-2000, unlimited> (SBC 7000 range is 1-6000, unlimited)
		callRateMax <1-1000, unlimited> (SBC 7000 range is 1-3000, unlimited)
		otherReqBurstMax <1-2000, unlimited> (SBC 7000 range is 1-6000, unlimited)
		otherReqRateMax <1-2000, unlimited> (SBC 7000 range is 1-6000, unlimited)
		registerBurstMax <1-2000, unlimited> (SBC 7000 range is 1-6000, unlimited)
		registerRateMax <1-2000, unlimited> (SBC 7000 range is 1-6000, unlimited)
		subscribeBurstMax <1-2000, unlimited> (SBC 7000 range is 1-6000, unlimited)
		subscribeRateMax <1-2000, unlimited> (SBC 7000 range is 1-6000, unlimited)
	emergencyOversubscription <1-1000>
	ingress 
		callBurstMax <1-2000, unlimited> (SBC 7000 range is 1-6000, unlimited)
		callRateMax <1-1000, unlimited> (SBC 7000 range is 1-3000, unlimited)
		otherReqBurstMax <1-2000, unlimited> (SBC 7000 range is 1-6000, unlimited)
		otherReqRateMax <1-2000, unlimited> (SBC 7000 range is 1-6000, unlimited)
		registerBurstMax <1-2000, unlimited> (SBC 7000 range is 1-6000, unlimited)
		registerRateMax <1-2000, unlimited> (SBC 7000 range is 1-6000, unlimited)
		subscribeBurstMax <1-2000, unlimited> (SBC 7000 range is 1-6000, unlimited)
		subscribeRateMax <1-2000, unlimited> (SBC 7000 range is 1-6000, unlimited)
	parentSharedCacLimitsPoolName <name>
	registrationLimit <0-2000000000, unlimited>
	subscriptionLimit  <0-2000000000, unlimited>

Command Parameters

Global CAC Parameters

Caption
0Table
1Global CAC Parameters


Parameter

Description

cac

Use this object to specify shared CAC-limits pool name.

sharedCacLimitsPool

  • <pool_name> – The name of the shared CAC-limits pool. Object containing CAC-limits that apply to a set of trunk groups.
  • bandwidthLimit – (Default is 'unlimited') Total Media Bandwidth Limit (in Kbits/sec). (range: 0-2000000000, or unlimited)
  • bandwidthLimitThreshold – (Default = 0) Enter threshold value (as a percentage) to specify bandwidth utilization notification threshold. (range: 0-100)
  • bandwidthVideoThreshold – (Default = 0) Enter threshold value (as a percentage of video bandwidth) to limit video streams to a specific bandwidth to prevent video calls consuming call bandwidth otherwise needed for audio calls. (range: 0-100)
  • callLimit – (Default is 'unlimited') The total number of concurrent calls (either ingress or egress) allowed. (range: 0-2000000000, or unlimited)
  • callLimitThreshold – (Default = 0) Call Limit utilization notification threshold, as a percentage. (range: 0-100)
  • egress – Egress-specific CAC configuration. (See Egress/Ingress Parameters table below for details)
  • emergencyOversubscription – (Default = 100) The percentage over the configured allowed number of resources for an IP trunk group that Emergency calls can consume. Up to 10x can be allocated. (range: 1-1000)
  • ingress – Ingress-specific CAC configuration. (See Egress/Ingress Parameters table below for details)
  • parentSharedCacLimitsPoolName – Name of an existing shared CAC-limits pool.
  • registrationLimit – (Default is 'unlimited') The total number of concurrent SIP registrations allowed. (range: 0-2000000000, or unlimited)
  • subscriptionLimit – (Default is 'unlimited') The total number of concurrent SIP subscriptions allowed. (range: 0-2000000000, or unlimited)


Egress/Ingress Parameters

Info

The default value for all of the CAC parameters below is 'unlimited'.


Caption
0Table
1Egress/Ingress Parameters
3Egress/Ingress Parameters


ParameterLength/RangeDescriptions
callBurstMax

SBC 5xx0/SWe: 1-2000, or unlimited

SBC 7000: 1-6000, or unlimited

<value> – Maximum allowed burst (above the allowed sustained rate) for egress call attempts.
callRateMax

SBC 5xx0/SWe: 1-1000, or unlimited

SBC 7000: 1-3000, or unlimited

<value> – Maximum sustained egress call rate allowed in calls/second.

NOTE: You can set both "callRateMax" and "callBurstMax" as "unlimited"; however, if you assign a value to one parameter, the other must also be assigned a value.

otherReqBurstMax

SBC 5xx0/SWe: 1-2000, or unlimited

SBC 7000: 1-6000, or unlimited)

<value> – Maximum allowed burst (above the allowed sustained rate) for all other egress out-of-dialog SIP request.
otherReqRateMax

SBC 5xx0/SWe: 1-2000, or unlimited

SBC 7000: 1-6000, or unlimited)

<value> – Maximum sustained egress rate of all other out-of-dialog SIP request allowed in one second.

registerBurstMax

SBC 5xx0/SWe: 1-2000, or unlimited

SBC 7000: 1-6000, or unlimited)

<value> – Maximum allowed burst (above the allowed sustained rate) for egress initial SIP registrations.

registerRateMax

SBC 5xx0/SWe: 1-2000, or unlimited

SBC 7000: 1-6000, or unlimited)

<value> – Maximum sustained egress rate of initial SIP registrations allowed.

NOTE: You can set both "registerBurstMax" and "registerRateMax" as unlimited; however, if you assign a value to one parameter, the other must also have a value.

subscribeBurstMax

SBC 5xx0/SWe: 1-2000, or unlimited

SBC 7000: 1-6000, or unlimited)

<value> – Maximum allowed burst (above the allowed sustained rate) for egress initial SIP Subscribe request.

subscribeRateMax

SBC 5xx0/SWe: 1-2000, or unlimited

SBC 7000: 1-6000, or unlimited)

<value> – Maximum sustained egress rate of initial SIP SUBSCRIBE request allowed in subscribes/second.


 


Command Example

Code Block
languagenone
% set global cac sharedCacLimitsPool POOL bandwidthLimit 
   1000 bandwidthLimitThreshold 1 callLimit 1000 
   callLimitThreshold 1 egress callBurstMax 50
% show global cac
   sharedCacLimitsPool POOL {
	callLimit 1000;
	callLimitThreshold 1;
	bandwidthLimit 1000;
	bandwidthLimitThreshold 1;
	egress {
		callBurstMax 50;
	}
   }