True Statements about Cisco Unified Communications Manager Mixed-Mode Clusters

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Cluster security mode configures the security capability for a standalone server or a cluster.Cluster security mode configures the security capability for a.

References: http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/security/7_0_1/secugd/sec701-cm/secuauth.html#wp1037433

A Cisco Unified Communications Manager (CUCM) mixed-mode cluster is a deployment model that allows both SCCP (Skinny Client Control Protocol) and SIP (Session Initiation Protocol) devices to register with the CUCM cluster. This means that both Cisco IP phones and third-party SIP phones can be integrated into the same cluster.

Now, let's take a closer look at the statements provided and determine which ones are true:

A. Cluster security mode configures the security capability for your standalone server or a cluster. This statement is true. The cluster security mode is a global setting that applies to all nodes within the CUCM cluster. It specifies the level of security that is used for inter-node communication, such as database replication and call processing.

B. The device security mode in the phone configuration file is set to nonsecure. This statement could be true, but it depends on how the phones are configured. The device security mode specifies the security settings that are used for phone registration and communication with the CUCM cluster. If the phone configuration file has device security mode set to "nonsecure," then the phone will not use any security measures when communicating with the CUCM cluster.

C. The phone makes nonsecure connections with Cisco Unified Communications Manager even if the device security mode specifies authenticated or encrypted. This statement is false. If the device security mode is set to "authenticated" or "encrypted," then the phone will attempt to establish a secure connection with the CUCM cluster. If the CUCM cluster is configured for mixed mode, then the phone will be allowed to register even if it cannot establish a secure connection, but it will still attempt to use security measures.

D. Security-related settings other than device security mode, such as the SRST Allowed check box, get ignored. This statement is false. The SRST (Survivable Remote Site Telephony) Allowed check box specifies whether phones are allowed to fall back to a local SRST router if they lose connectivity to the CUCM cluster. This setting is independent of the device security mode and will be honored regardless of whether the cluster is in mixed mode or not.

E. Auto-registration does not work when you configure mixed mode. This statement is false. Auto-registration is a feature that allows phones to automatically register with the CUCM cluster without the need for manual configuration. This feature is supported in mixed mode deployments, but it is important to ensure that security measures are in place to prevent unauthorized devices from registering with the cluster.

In summary, the true statements about Cisco Unified Communications Manager mixed-mode clusters are:

• Cluster security mode configures the security capability for your standalone server or a cluster.
• The device security mode in the phone configuration file is set to nonsecure. (potentially true, depending on phone configuration)