What prevents toll fraud on voicemail ports?

An engineer needs to configure individual call handler greetings on Cisco Unity Connection so that a single greeting can override all other greetings set by users during a holiday period. Which type of greeting should be configured to accomplish this goal?

An end user opened a ticket, stating that before logging in to Jabber for Windows, a warning is displayed that a server certificate has expired. Which two certificates must be verified on the Cisco Unified Communications Manager and IM&P deployment? (Choose two.)

An administrator is configuring digital networking between Cisco Unity Connection clusters. What are two requirements for the configuration? {Choose two.) end-user credentials

An administrator is setting up the Cisco Unified IM and Presence on-premises high availability feature and wants the Server Recovery Manager to initiate failover after 90 seconds. However, failover is happening after 60 seconds How is this issue corrected?