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Rules for managing the MSC resources
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Voicemail and call center use one media channel for each active session.
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A call between an IP telephone and a digital or analog telephone or a PSTN line uses a media
channel for the duration of the call.
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A call from a digital or analog telephone that uses an IP trunk uses a media channel for the
duration of the call.
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A call between two IP telephones on the same Business Communications Manager uses a
media channel during call setup. After the call is established, the media channel is released.
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A call on an IP telephone using an IP trunk uses a media channel during call setup. After the
call is established, the media channel is released.
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IVR needs 1 media channel for each active session.
Since most of the devices do not use media channels all of the time, your system can have more
devices than there are media channels. However, to ensure you have sufficient system resources,
make sure the number of media channels you have exceeds your estimate of peak media channel
usage. The section below provides an example of how to estimate your peak media channel usage.
Example of how to estimate peak media channel usage
The example below is for a fictional company named CompanyABC. The numbers used are
strictly for this example. Actual numbers will vary depending on the company. When you are
estimating your peak media channel usage, make sure you use numbers that reflect your business.
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CompanyABC has a Business Communications Manager system with 96 telephones. Of these
telephones, 48 are digital telephones and 48 are IP telephones.
The percentage of IP telephones is 50% (48/96). This percentage is used to estimate how many
calls will be made between IP telephones and digital telephones.
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In CompanyABC, the users are typically on the telephone 15 minutes out of each hour, or 25%
of the time. During peak hours, the users are on the telephone 30 minutes, or 50% of the time.
Therefore, the peak usage of IP telephones is 24 (50% X 48 IP telephones).
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In CompanyABC, half of the calls are made to external destinations and half of the calls are
made within the Business Communications Manager system. CompanyABC does not have IP
trunks, so the calls from the IP telephones to external destinations must use PSTN lines.
The peak number of IP telephone calls that use PSTN lines is 12.
(50% of calls external X 24 IP telephones during peak usage).
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For internal calls, there is a 50% chance the call is made to a digital telephone.
The peak number of IP telephone calls to digital telephones is 6.
(50% of calls internal X 24 IP telephones peak usage X 50% number of digital telephones)
•
The peak media channel usage for IP telephony is 18.
(12 media channels for external calls and 6 for calls made to digital telephones.)
N0008589 3.3
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