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call_admission_control_features.fm
A31003-H8022-F100-2-7618, October 2006
HiPath 8000 V2.2, Feature Description Guide
10-3
Call Admission Control Features
Functional Operation
The IP address and name of the WAN access router serving the CAC group (such as a
branch office) that sends SNMP traps indicating the link up/down status of the primary
access link. This item is only required if the optional Link Failure Web Service is used.
Refer to the
HiPath 8000 Web Services SDK (Software Development Kit), Application
Developer’s Guide for Link Failure Management
for more information about this Web
service.
One CAC policy can be related to one CAC group. A CAC group, on the other hand, can be
related to up to two CAC policies. This permits the use of allow different policies for audio and
fax traffic for the same group.
Only the following combinations are allowed for CAC policies related to the same CAC group:
One policy for audio and/or one policy for fax
-or-
One policy for both audio and fax
10.3 Functional Operation
A resource manager (RM) function within HiPath 8000's universal call engine (UCE) integrates
bandwidth management with call processing in order to provide robust call handling, such as
the rerouting of a call via the PSTN when there is insufficient bandwidth in the enterprise
network to carry the call, based on bandwidth availability.
When a new call is placed, the following takes place:
1. The predicted bandwidth needed for the new call is compared to the remaining available
bandwidth for each bottleneck link in the connection based on the CAC group and policies
assigned to the originating and destination endpoints.
2. The HiPath 8000 reserves the bandwidth and allows the call to proceed if there is sufficient
bandwidth on each bottleneck link in the route.
3. After the call is answered and connected, HiPath 8000 adjusts the bandwidth reservation
for the call based on the actual negotiated codec that is selected by the source and
destination endpoints.
4. After the call is released, the bandwidth resource is also released.
The HiPath 8000 reroutes or denies the call if there is insufficient bandwidth on any of the
bottleneck links. Refer to Section 10.4, “CAC Rerouting” and Section 10.5, “Call Denial”, on
page 10-5.
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