This document covers the Configuration procedures with deployment examples to Implement Call Admission Control (CAC) on Cisco Unified Border Element (CUBE). Call Admission Control plays a major role in the network to control the number of calls based on the available resources and bandwidth.
What is CAC and Why it is required ?
CAC is nothing but Call Admission Control which
Controls number of calls based on resources & bandwidth
Proactively reserve resources for good quality video calls
Ensure traffic adheres to QoS policies within each network
CUBE can provide six different CAC mechanisms based on,
IP call capacity
Call Spike detection
Dial-peer / Interface bandwidth
CAC mechanisms ensure good QoS for video and voice calls and help meet the SLA
1. CAC Based on Total Calls, CPU or Memory
call threshold global [total/mem/cpu] calls low xx high yy
call treatment on
call threshold global [total-calls | cpu-5sec | cpu-avg | total-mem | low <low-threshold> high <high-threshold>
call treatment on
call treatment cause-code ?
busy Insert cause code indicating the GW is busy (17)
no-QoS Insert cause code indicating the GW can't provide QOS (49)
no-resource Insert cause code indicating the GW has no resource (47)
Call threshold values for total concurrent calls or CPU or memory to be handled by CUBE can be defined
Call treatment can be turned on to handle the call once the CAC limit is reached
2. CAC Based on IP Call Capacity
endpoint circuit-id h323id CUBE1 AA max-calls 500
voice service voip
allow-connections h323 to h323
ip circuit max-calls 1500
ip circuit carrier-id AA reserved-calls 1000 <Note Number is twice because of 2 call legs>
IP call capacity on CUBE works in conjunction with the Cisco Gatekeeper (GK)
Call counting mechanism does not take into account the codec type used – this is taken into account by enabling bandwidth management on the Cisco GK
This only works if at least 1 call leg on CUBE is using H.323
3. CAC Based on Max Connections per destination
dial-peer voice 1 voip
Restricting the number of concurrent calls that can be active on a VoIP dial peer
Max-Conn works on individual dial-peers, does not provide CAC for the entire gateway
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