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call_admission_control_features.fm
A31003-H8022-F100-2-7618, October 2006
HiPath 8000 V2.2, Feature Description Guide
10-1
Call Admission Control Features
Definition
10 Call Admission Control Features
This chapter describes the HiPath 8000’s integrated call admission control (CAC) feature,
which provides for management of the bandwidth used for the transport of media traffic (such
as RTP audio and T.38 fax) through the bottleneck links that may exist in an enterprise network.
10.1 Definition
The call admission control (CAC) feature ensures that real-time media calls are only
established when the necessary bandwidth resources are available on all access links that
exist between the two communicating endpoints.
Real-time media calls should not be routed over networks that cannot guarantee an acceptable
quality of service (QoS). An enterprise core network and the subnets serving its branch offices
must provide sufficient bandwidth to support the real-time media traffic they are required to
handle. It is also necessary for the real-time media packets to be correctly classified so that the
network routers can provide the appropriate priority processing through their queues.
Loss of media packets can still occur at the aggregation layer that exists on bandwidth-limited
access link that exists between a branch office LAN and the core network WAN. This can
happen when the total bandwidth capacity of the access link is overbooked to an extent that
forces the access routers to drop even high-priority real-time media packets. The result is a
poor quality connection for all multimedia calls that are routed over the overbooked access link.
CAC provides the bandwidth management that prevents these poor-quality connections from
being established.
>
Refer to the following for information about administration and operational practices
associated with this feature:
HiPath 8000 SOAP/XML Subscriber Provisioning Interface Guide
HiPath 8000 Configuration and Administration Using CLI Guide
HiPath 8000 Configuration and Administration Using NetManager iNMC Guide
HiPath 8000 Subscriber Accounts/Services Administration Using NetManager
iSMC Guide
HiPath 8000 System Feature Configuration Using NetManager iNMC and iSMC
Guide
HiPath 8000 Assistant Administrator Documentation
HiPath 8000 Configuration and Administration Using HiPath Assistant
HiPath 8000 Assistant Feature Configuration Administration Guide
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