Configuring Cisco Unified Communications Manager
To enable teleconferencing on Cisco Webex Meetings Server you must configure one (or more) Cisco Unified Communications Manager (CUCM) system to manage call control. Optionally you can configure a second CUCM system for audio high availability.
CUCM in an MDC Environment
The CUCM configurations in a Multi-data Center (MDC) environment are the same as in a Single-data Center (SDC) environment. Configuration parameters modified on one data center are automatically matched on the other data center.
On CUCM, the basic configurations in a Multi-data Center (MDC) environment are the same as in a Single-data Center (SDC) environment. However, you must configure trunks to all data centers. Each data center can have a different route pattern. If you want to use more than one CUCM, each data center must have a SIP trunk to the CUCM in the other data centers for calls to transfer.
CUCM Secure Teleconferencing in an MDC Environment
It is not possible to import certificates from all data centers in a Multi-data Center (MDC) into a single Cisco Unified Call Manager (CUCM) as needed to secure teleconferencing when the common name of both certificates is the same.
By default, the common name for all data centers is the global site URL of the system. However, to make the common name unique, you can generate certificates. For more information, see Generating a Certificate Signing Request (CSR). Select the local site URL instead of the global site URL to use in the common name.
Self-signed certificates generated during any system altering procedure (such as changing the site or administration URL, changing hostnames) results in a certificate that has the global site URL in the common name, so you must manually create certificates with the local site URL after this type of operation.
CUCM Configuration for Extended Systems
When you extend a large system, you must configure another SIP Trunk for each new media server that you add. A large system requires 3 SIP Trunks, so an extra large system requires 4–6, depending on the numbe of extension units.