I read on Cisco Unified Communications Manager Real-Time Monitoring Tool Administration Guide, Release 8.0 to activated the email message of alerts: To configure RTMT to send alerts via e-mail, you must configure DNS. For information on configuring
the primary and secondary DNS IP addresses and the domain name in Cisco Unified Communications
Manager Server Configuration, see the “DHCP Server Configuration” chapter in the Cisco Unified
Communications Manager Administration Guide.
But or installation of the service we use the router like our DHCP server to give IP address to the ipphones and also for PC. Right now our clients they are working with this topology.
You know another solution to stablish email notifications.
No, this is applied on the UCM OS CLI. I hyperlinked the commands to the supporting documentation for you. You can also review the Command Line Interface Reference Guide for Cisco Unified Communications Solutions Release 8.0(2) if you prefer.