Cisco CallManager Service Configuration
Once this process is completed, every time a call is placed (even for uncompleted
calls), a CDR is generated. If there is only a single CallManager, the CDR
will obviously be created on this single Server; however, if there are multiple
CallManagers making up a cluster, there will be both a publisher and subscribers.
Based on which CallManager within the cluster is the publisher (this is defined
when installing the CallManager software), the CDR will be created on the publisher
alone.
Cisco provides a solution as an add-on that can be downloaded from
www.cisco.com.This solution is called Cisco Administrative Reporting Tool
(ART), and can be used to provide basic billing as well as the QoS on the network.
Looking at the screenshot that follows, it is possible, via this tool (which is
accessed from the CallManager main screen), to provide reports in PDF format
that can give you, for example, the billing per individual for a specific date range.
ART does have its limitations, however. For instance, it can only handle up to
2,000,000 CDRs.This may seem like a lot, but remember, for each inbound or
outbound call, information must be logged.To turn this idea into an example:
Suppose there are 250 employees in Company XYZ, who make and receive,
on average, around 15 calls per person per day.To define how long ART would
last, you would have to perform a calculation as follows:
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Figure 7.3 Cisco CallManager Service Configuration
AVVID Applications • Chapter 7 211
250 (employees) x 15 (calls per day) = 3750
2000000 (max CDRs supported by ART) / 3750 (CDRs per day) = 530
In the preceding example, it is clear we have enough capabilities within ART
to support up to approximately 530 days worth of CDRs. Again, this may sound
like a lot, but if you run a call center, or have dialing campaigns, you will need to
work out the maximum number of CDRs per day (see Figure 7.4).