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•
Maximum Number of Calls: This setting defines the number of simultane-
ous calls allowed by the system. Because every call requires a certain portion
of the available CPU, allowing too many calls will affect the quality of all
ongoing calls. By limiting the number of calls on the CPU, you can reject calls
that would otherwise potentially degrade overall performance. On modern
PCs, 100 or more calls can run on one computer; however, on an embedded
system, you will probably have much less CPU power and thereby increase the
probability of running out of CPU power if you allow that many calls. If this
field is left blank, the key in the system will limit the calls, or the CPU limita-
tion, when reached, will limit the calls.
•
Processor Affinity Mask: This field allows the administrator to assign a
particular CPU to the pbxctrl system process. When using a multiple-core
CPU, the operating system has to assign processes to processors. By default,
the operating system tries to balance out the load so that the overall system
performance is as fast as possible. However, the disadvantage with this ap-
proach is that the whole process gets stuck for some time while moving the
processes from one CPU to another. If during that time the CPU should play
out media, it will come across as stuttering and be perceived as jitter coming
from the system. In order to avoid this problem, bind the pbxctrl to one fixed
CPU. Depending on the operating system, you can do this manually or you
can ask the system processes to do this during startup. Changes to this field
require a system restart.
•
Maximum Duration of Call Recording: This setting allows you to establish
an upper limit on call recordings, which is important since large recordings
can cause problems with system performance. To further conserve on disk
space, you can limit the number of messages that can be stored in a user's
voicemail box (see the Voicemail Size setting on page 98).
•
Max. size of a configuration backup file: This setting allows you to establish
the maximum size, in bytes, of the backup file. The default is 1 MB. If your
system has a lot of data to be backed up, increase this value. The backup fea-
ture through the web interface is used mostly in the appliances (in embedded
systems where the file access is primitive). On other systems, it is advisable to
use the OS file manager to do the backup.
Chapter 2: System Settings
49
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