Operation
CUCM evaluates called numbers and activates gateway events to receive or send calls to the PSTN or IP Network.
CUCM is installed on either a Cisco Media Convergence Server (MCS) or other Cisco approved hardware (including Vmware ESXi virtual machines).
Typically, a CCM cluster can manage up to 30,000 IP Phones using 20 Servers which incorporates a publisher, two TFTP servers, 8 Subscribers (four primary and four secondary) and up to nine media resource servers.
The Cisco Unified Communications Manager "Supercluster" can manage up to 60,000 phone numbers, and incorporates a publisher, two TFTP servers, 16 Subscribers (eight primary and eight secondary) and up to nine media resource servers.
Read more about this topic: Cisco Unified Communications Manager
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“Human knowledge and human power meet in one; for where the cause is not known the effect cannot be produced. Nature to be commanded must be obeyed; and that which in contemplation is as the cause is in operation as the rule.”
—Francis Bacon (1560–1626)